Answers
For this problem, we need to do a rule of three, like this:
\(\begin{gathered} 125\text{ MG medicine }\to\text{ 150 LB} \\ \text{? MG medicine }\to\text{ 142 LB} \end{gathered}\)And the calculation would be:
\(142\text{ LB}\cdot\frac{125\text{ MG medicine}}{150\text{ LB}}=118.33\text{ MG medicine.}\)The appropriate medication for this patient is 118.33 MG.
Related Questions
What is the definition of electron configuration. and thanks
Answers
Answer:
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s² 2s² 2p⁶, using the notation explained below
Explanation: welcome
Calculate the volume of a box which is 125 cm long, 37 cm wide, and 68 cm high. Report your answer with correct significant figures in cubic centimeters. please use significant figures!
Calculate the volume of a box which is 423 cm long, 12 cm wide, and 25 cm high. have significant figures in cubic centimeters.
Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a table. Mass of weigh boat 1.326 g Mass of weigh boat and sample 7.635 g What is the mass of the solid sample?
A graduated cylinder contains 10.00 mL water. A 14.74 g piece of aluminum is added to the water, and the volume rises to 15.46 mL. What is the density of the aluminum?
A 24.5 g sample of solution has a density of 0.768 g/mL. What is the sample volume (in mL)?
Answers
Answer:
1. Volume of box is 314500 cm³.
2. Volume of box 126900 cm³.
3. Mass of sample is 6.309 g.
4. Density of aluminum is 2.7 g/mL.
5. Volume of sample is 31.9 mL.
Explanation:
1. Determination of the volume of the box
Length (L) = 125 cm
Width (W) = 37 cm
Height (H) = 68 cm
Volume (V) =?
V = L × W × H
V = 125 × 37 × 68
V = 314500 cm³
2. Determination of the volume of the box
Length (L) = 423 cm
Width (W) = 12 cm
Height (H) = 25 cm
Volume (V) =?
V = L × W × H
V = 423 × 12 × 25
V = 126900 cm³
3. Determination of the mass of the sample.
Mass of weigh boat = 1.326 g
Mass of weigh boat + Sample = 7.635 g Mass of the sample =?
Mass of Sample = (Mass of weigh boat + Sample) – (Mass of weigh boat)
Mass of Sample = 7.635 – 1.326
Mass of Sample = 6.309 g
4. Determination of the density of aluminum.
Volume of water = 10 mL
Mass of aluminum = 14.74 g
Volume of water + aluminum = 15.46 mL
Density of aluminum =?
Next, we shall determine the volume of aluminum. This can be obtained as follow:
Volume of water = 10 mL
Volume of water + aluminum = 15.46 mL
Volume of aluminum =?
Volume of aluminum = (Volume of water + aluminum) – (Volume of water)
Volume of aluminum = 15.46 – 10
Volume of aluminum = 5.46 mL
Finally, we shall determine the density of aluminum. This can be obtained as follow:
Mass of aluminum = 14.74 g
Volume of aluminum = 5.46 mL
Density of aluminum =?
Density = mass / volume
Density of aluminum = 14.74 / 5.46
Density of aluminum = 2.7 g/mL
5. Determination of the volume of sample.
Mass of sample = 24.5 g
Density of sample = 0.768 g/mL.
Volume of sample =?
Density = mass / volume
0.768 = 24.5 / volume of sample
Cross multiply
0.768 × Volume of sample = 24.5
Divide both side by 0.768
Volume of sample = 24.5 / 0.768
Volume of sample = 31.9 mL.
Which statement is part of the currently accepted atomic model?
A. Atoms are the smallest particles of matter and cannot be divided.
B. An atom is made up of a nucleus surrounded by electrons that
travel in orbits.
C. An atom is a positively charged ball with electrons scattered
throughout
D. An atom is made up of electron clouds with different energy levels
that surround a nucleus.
Answers
Answer:
D.an atom is made up of electron cloud with different energy levels that surround a nucleus
The statement which is the part of the currently accepted atomic model is; An atom is made up of electron clouds with different energy levels that surround a nucleus. Option D is correct.
This statement is the part of the currently accepted atomic model, known as the "quantum mechanical model" or "electron cloud model." According to this model, electrons are not confined to specific orbits as proposed by the Bohr model. Instead, electrons will exist in the region of space around the nucleus called energy levels or electron clouds.
These energy levels correspond to different amounts of energy that electrons can possess within the atom. Electrons within these energy levels have specific quantum numbers that describe their properties, such as energy, angular momentum, and magnetic properties. The electron cloud model provides a more accurate description of the behavior of electrons in atoms, allowing us to better understand their behavior and chemical properties.
Hence, D. is the correct option.
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Why is it when you add 4 electrons to Beryllium it becomes a neutral atom?
Answers
because since there are now 4 electrons(-) you can tell that it had 4 protons (+) before so -4+4 is 0 which makes it neutral. hope it helps.
Answer:
Because it takes 8 electron's to become a netural atom there fore when you add 4 electrons to Beryllium it becomes a netural atom and a stable substadnce.
Explanation:
Rank the following elements by electron affinity, from most positive to most negative EA value. Rank from most positive to most negative.
a. fluorine
b. helium
c. tellurium
d. rubidium
e. phosphorus
1. Most positive
2. Most negative
Answers
Answer:
Most positive = rubidium
Most negative = fluorine
Explanation:
Electron affinity of an element is the energy released when an electron is attached to a neural atom to form an ion in its gaseous state.
X + e⁻ → X⁻
Electron affinity is similar to electronegativity which is the tendency at which an atom accepts an ion towards itself.
Electron affinity increases across the period and decreases down the group in the periodic table.
In the above option,
Fluorine has the highest electron affinity
Rubidium has the lowest electron affinity
Tellurium and then finally Phosphorus
Helium in this case would have the lowest electron affinity because it has filled orbital and does not require any electron to attain stability. Technically, Helium has the lowest or is expected to have the lowest electron affinity which is close to zero according to quantum mechanics.
Most positive = rubidium
Most negative = fluorine.
You can check periodic table for their exact values
Iron is a metal. The structure of iron is described as a lattice of positive ions in a sea of
electrons. Which of the following statements about iron are correct?
1 iron conducts electricity because the electrons are free to move
2 iron has a high melting point due to the strong covalent bonds
3 iron is an alloy
4 iron is malleable because the layers of atoms can slide over one another
A. 1 only
B. 1 and 3
C. 1 and 4
D. 2, 3 and 4
Answers
Answer: 1and 4
Explanation: iron is an element not an alloy. An ionic lattice is not bonded covalently.
HELPPPPP
54.5 g of Ca(NO3)2 was used to create a 1.5 M solution. What is the volume of the solution in ml?
Answers
We have already been introduced to solutions. Several chapters ago molarity (M) was introduced. Molarity is measured in moles per liter, or mol/L. A 0.30 M NaCl solution means that there is 0.30 mol NaCl in every liter of solution.
Often chemists have to make solutions; so, doing the calculations necessary to make a certain amount of solution become second nature.
For example:
Make 250 mL of a 0.30 M NaCl solution.
To make the solution we need to calculate the amount of NaCl to dissolve to make 250 mL of solution.
start with 250 mL
The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up to the line on the volumetric flask.
But molarity is not the only unit we use; so, we need to be able to convert between different units...
Common units of concentration include
<==> <==><==>
% wt.
% vol
molarity (M)
molality (m)
mol fraction
That is, the mol fraction of "a" is the number of moles of "a" present divided by the total number of moles of material in the solution (including the solvent).
There is no simple formula for converting from one concentration unit to the next. In general the first step is to pick a convenient sample size. Then work to change each part of the concentration unit to the new unit. Do not try to do the conversion all at once.
For example,
HCl comes in bottles marked 37 % HCl by weight. The density of the solution is 1.200 g/cm-1. What is the molarity of the solution?
A conveneint sample size is 100 g of solution; convenient because 100 g x 37% = 37 g HCl.
This is the key...you must know the definitions for all the concentration terms
First, convert number of grams of HCl in your sample to number of moles in your sample (the 100 g of solution).
Second, convert g of solution to L of solution.
Third, divide moles by liters and you have molarity.
What is the molality of this solution?
Going from M to m. Since the concentration is in M a convenient sample size is 1 L.
OK, so the first conversion is not a conversion...there are 12 mol HCl present in 1 L of solution.
The second conversion is not as easy as it first appears. Let's use the density of the solution to perform a conversion from volume to mass.
This is NOT the mass that is used in molality. We just determined the mass of the solution; molality uses the mass of the SOLVENT!
The solution is made of a solvent and a solute. So, the mass of solvent can be found by subtracting the mass of the solute from the mass of the solution.
What is the average mass of a single silicone atom in grams?
Answers
What percent of the moon is
ALWAYS reflecting light?
Answers
Answer:
12%
Explanation:
Answer:
3-12%
Explanation:
Im not completely sure if this is accurate, but hope with somewhat helps.
What does +430 degrees celsius feel like?
Answers
At this temperature, objects would be glowing red or even white-hot. It is important to note that human skin would suffer immediate and severe burns upon contact with surfaces at such temperatures. Additionally, the air would be scorching and potentially unbreathable due to the heat.
In summary, +430 degrees Celsius would be an intensely hot and dangerous environment, far beyond what humans can tolerate or safely experience.
- I Hope This Helps! :)
• Please Give Brainliest
which statement describes the components of a mixture
Answers
Answer:
Uh to answer the question we need to SEE the statements..
How many grams of F2 are in 3.45 x 1022 molecules of F2?
Answers
Answer:
Mass = 2.16 g
Explanation:
Given data:
Number of molecules of F₂ = 3.45 × 10²²
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
3.45 × 10²² molecules ×1 mol / 6.022 × 10²³ molecules
0.57× 10⁻¹ mol
0.057 mol
Mass in gram :
Mass = number of moles × molar mass
Mass = 0.057 mol × 37.9 g/mol
Mass = 2.16 g
Calculating the average atomic mass from Isotope data
Answers
The relative atomic masses of the given elements are as follows:
Lead = 206.96 amuMagnesium = 24.62 amuSilicon = 28.08 amuWhat is relative atomic mass?Relative atomic mass is the sum of the product of the isotopic masses and the relative abundance of the isotopes of an element.
Relative atomic masses are averages.
The relative atomic masses of the given elements are calculated as follows:
1. Lead:
Relative atomic mass = (203.973 * 0.014) + (205.974 * 0.236) + (206.759 * 0.226) + (207.9766 * 0.523)
Relative atomic mass = 206.96 amu
2. Magnesium:
Relative atomic mass = (23.985 * 79.99) + (24.986 * 10%) + (25.983 * 11.01%)
Relative atomic mass = 24.62 amu
3. Silicon:
Relative atomic mass = (27.977 * 92.21%) + (28.976 * 4.70%) + (29.973 * 3.09%)
Relative atomic mass = 28.08 amu
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What inference can be drawn from the graph?
A+B=C+D
45
40
35
30
25
Concentration
20
15
10
5
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Time (seconds)
OA. The reaction between A and B is reactant favored.
OB. The amount of product is greater than the amount of reactant.
OC. The reaction uses all its reactants to form products.
OD. The reaction reaches equilibrium at 1.5 seconds
OE. The amount of reactants is highest at equilibrium.
Answers
Answer:
i think its C
Explanation:
The graph indicates that the reaction reaches equilibrium around 1.5 seconds. The graph shows how the concentrations of reactants and products change over time until they eventually become constant. So, the correct option is D.
What is an Equilibrium?Equilibrium is a state in a chemical process when forward and backward reactions occur at the same rate, meaning that the concentrations of reactants and products do not change with time. In other words, the forward reaction rate equals the reverse reaction rate.
In the example above, the graph indicates that the reaction reaches equilibrium in about 1.5 seconds. The graph shows how the concentrations of reactants and products change over time until they eventually become constant. This indicates that the reaction has reached equilibrium when obtained in approximately 1.5 seconds.
So, the correct option is D.
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What are ALL full chemical reactions that ensue for each of the following disinfectants (may be more than one for each): (5 points) Cl2 (g) at pH 9
Answers
Answer:
The reactions that might ensue are
Cl\(_{2}\)(g) + H\(_{2}\)O ---------- > HOCl + HCl
HOCl -------- > \(H^+\)(aq) + O\(CI^-\)(aq)
Cl2(g) + \(OH^-\)(aq) ----- > O\(CI^-\)(aq) + HCl
Explanation:
The Disinfectant Given is
CI2 (g) at PH 9
Determine the chemical reactions that might ensue
due to the High concentration of \(H^{+} (aq)\) the formation of \(OCI^-\)(aq) will be better and this will decrease the power of the disinfectant.
Hence the chemical reactions that might ensue can be represented below as :
Cl\(_{2}\)(g) + H\(_{2}\)O ---------- > HOCl + HCl
HOCl -------- > \(H^+\)(aq) + O\(CI^-\)(aq)
Cl2(g) + \(OH^-\)(aq) ----- > O\(CI^-\)(aq) + HCl
What branch of science studies The Periodic Table?
A.Biology
B.Earth Science
Chemistry
Atoms mover slower in the ____________. *
A.heat
B.cold
Atoms move faster in the __________. *
A.heat
B.cold
A nucleus is made of ________ and _________. *
A.protons and electrons
B.electrons and neutrons
C.protons and neutrons
Protons have what type of charge? *
A.neutral
B.negative
C.positive
Neutrons have what type of charge? *
A.neutral
B.negative
C.positive
Atoms have empty space. *
A.True
B.False
What is the center of an atom called? *
A.Neutron
B.Nitrogen
C.Nucleus
The atomic number represents the number of _______. *
A.protons
B.neutrons
C.electrons
What family of elements is most stable? *
A.metals
B.nonmetals
C.Nobel gasses
What scientist is credited with designing The Periodic Table? *
A.Albert Einstein
B.Isaac Newton
C.Dmitri Mendeleev
Atomic mass is found at the _______________.
A.top of the square
B.the middle of the square
C.the bottom of the square
The Periodic Table has elements that are liquids, gasses, and solids. *
A.True
B.False
With an atomic number of 1, which element is the lightest? *
A.Helium
B.Xenon
C.Hydrogen
D.Radon
Answers
Answers:
1. Chemistry
2. Cold
3. Heat
4. Protons and neutrons
5. Positive
6. Neutral
7. True
8. Nucleus
9. Protons
10. Nobel gasses
11. Dmitri Mendeleev
12. the bottom of the square
13. True
14. Helium
Write a balanced nuclear equation for the beta decay of 234/90Th
Answers
The balanced nuclear equation for the beta decay of 234/90Th can be represented as follows: ^234/90Th --> ^234/91Pa + e^0/-1β
In this equation, the nucleus of thorium-234 (234/90Th) undergoes beta decay. During beta decay, a neutron within the nucleus is converted into a proton, resulting in the emission of an electron (beta particle). As a result, the thorium-234 nucleus is transformed into protactinium-234 (234/91Pa) by gaining one proton.
The beta particle emitted during the decay process is represented as e^0/-1β, where the superscript 0 denotes that the electron has no charge (neutral), and the subscript -1 indicates that the electron carries a negative charge of -1.
It is important to note that in a nuclear equation, the total atomic mass and atomic number on both sides of the equation must be equal to maintain a balanced equation and conserve mass and charge.
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If the temperatures were raised slowly under the same conditions, would ice made from fresh water or sea water melt first? Which would boil first? Which of these would allow the temperature of an ice cream maker to drop below 0°C? Which requires colder temperatures to freeze, unsalted roads or salted roads? Which requires more heat to boil, pure water or a sugar solution used for making candy?
Answers
Answer:
1.sea water 2.fresh water 3. Salt and ice
4.salted roads 5. Sugar solution used for making candy
Explanation:
Because Truck
Answer:
salted roads
sugar something
pure water
Explanation:
trust me bro
PLEASE HURRY IM BEING TIMED time: 1:55:40
Which number belongsin the space labeled X?
O5
O7
O8
O 10
Answers
Answer:
a.) x = 5
Explanation:
What is the number of protons of an element with a mass number of 100 and a
neutron number of 40?
A.100
B.40
C.0
D.60
Answers
Answer:
D-60
Explanation:
Mass number =Proton number(P) + Neutron number
100=P+40
collect like terms
P=100-40
P=60
how many moles of AgCl will be produced from 60 g of AgNO3 assuming NaCl is available in excess
Answers
The mass of the silver chloride that is produced in the reaction is 50 g.
What is the stoichiometry?Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction.
Number of moles of the silver nitrate = 60 g/170 g/mol
= 0.35 moles
Since the reaction is 1:1, the mass of the silver chloride that is produced is;0.35 moles * 143 g/mol
= 50 g
Thus, only about a mass of 50 g of the chloride that is produced .
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the solubility of PbSO4 is 0.048g/Liter. what is the Ksp of PbSO4? (MMPbSO4 = 303.3)
Answers
Answer:
Ksp of PbSO4 is 2.5 *10^-8
Explanation:
Given -
Solubility of PbSO4 = 0.048g/Liter
[Pb+2] * [SO42-] = mass/molecular weight of PbSO4
[Pb+2] * [SO42-] = 0.048g/Liter/303.3g/mol = 0.000158 M
Concentration of PbSO4 = moles/volume = 0.000158 M/1L = 0.000158 M
Ksp = [Pb+2] * [SO42-]
ksp = 0.000158 * 0.000158 = 2.5 *10^-8
Liquid octane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . If 29.2g of carbon dioxide is produced from the reaction of 20.6g of octane and 98.6 of oxygen gas, calculate the percent yield of carbon dioxide.
Round your answer to 3 significant figures.
Answers
Now, we can calculate the percent yield of carbon dioxide using the following equation Percent yield of CO2 = 61.5% .
What is carbon dioxide?
Carbon dioxide (CO2) is a colorless, odorless gas composed of one carbon atom and two oxygen atoms. It exists in the Earth's atmosphere as a trace gas, making up approximately 0.04% of the atmosphere by volume. In nature, it is produced by the respiration of living organisms and through the decay of organic matter.
It is also a byproduct of many human activities such as burning fossil fuels, producing cement, and manufacturing plastic. Carbon dioxide is an important greenhouse gas, which means it absorbs and traps heat in the atmosphere, resulting in global warming.
The given reaction is:
CH3CH2CH3 + O2 → CO2 + H2O
m(octane) = 20.6 g
m(O2) = 98.6 g
m(CO2) = 29.2 g
Using the given information and the balanced equation, we can determine the theoretical yield of carbon dioxide by using the following equation:
m(CO2) (theoretical) = (m(octane) × molar mass of octane) / molar mass of CO2
m(CO2) (theoretical) = (20.6 g × 72 g/mol) / 44 g/mol
m(CO2) (theoretical) = 47.45 g
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Full Question ;
Liquid octane CH3CH26CH3 reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. If 29.2g of carbon dioxide is produced from the reaction of 20.6g of octane and 98.6g of oxygen gas, calculate the percent yield of carbon dioxide. Round your answer to 3 significant figures.
2. What happens when heat is removed from a substance at a critical temperature?
O A. The substance releases heat but won't change temperature until the state changes completely.
B. The temperature of the substance will change rapidly as heat is lost until the state changes completely.
C. The heat is cycled back into the substance, causing the temperature to increase.
D. The substance changes temperature at the same rate before, during, and after the change of state.
Answers
Please I need help thank you
Answers
Answer:
its sodium hydroxide
Explanation:
Does water have mass? Yes or no. Thanks everyone for your help
Answers
Answer: The density of a material is defined as its mass per unit volume. In this example, each volume of water is different and therefore has a specific and unique mass. The mass of water is expressed in grams (g) or kilograms (kg), and the volume is measured in liters (L), cubic centimeters (cm3), or milliliters (mL).
Explanation: HOPE IT HELPS :)
Which of the following is used to keep track of the heat flow inside a calorimeter?
Answers
Any time a liquid loses or receives energy, the temperature of the liquid changes.To calculate the amount pf energy change, the calorimeter monitors the weight of the fluid as well as the temperature change.
In a calorimeter, what thermometer is used?The 6000 series calorimeters' control systems serve as the foundation for the 6772 Calorimetric Thermometer, a high precision temperatures measuring device.It is a crucial component of both the 6755 Solution Calorimeter and the 6725 Semi-micro Calorimeter.
What equipment is utilized in calorimetry?The calorimeter is a piece of equipment used in calorimetry, a procedure for calculating heat capacity and measuring the temperature of chemical processes or other physical changes.Among the most popular kinds are differential scanning operating, thermal micro cathode rays, titration calorimeters, and accelerated rate calorimeters.
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Scoring: Your score will be based on the number of correct matches minus the number of incorrect matches. There is no penalty for missing matches. Use the References to access important values if needed for this question. Indicate whether each of the following compounds will gave an acidic, basic or neutral solution when dissolved in water.
1. ammonium bromide
2. potassium cyanide
3. sodium chloride
4. potassium iodide
Answers
Answer:
Explanation:
1 ) Ammonium bromide is a salt of ammonium hydroxide and hydrogen bromide . The former is a weak base and the later is a strong acid so the salt will make acidic solution in water. It happens due to salt hydrolysis.
2 ) Potassium cyanide is salt of potassium hydroxide and hydrogen cyanide . The former is strong base and the later is weak acid so its salt will be basic in nature .
3 ) sodium chloride is a salt of sodium hydroxide and hydrogen chloride . The former is strong base and later is strong acid. So the salt is neutral .
4 ) Potassium iodide is a salt of potassium hydroxide and hydrogen iodide . The former is a strong base and the later is a strong acid . So the salt is neutral or a bit basic.
The Adálie penguins feed on krill that live on the underside of ice sheets. Which of the following would help Adálie penguins survive during the melting of Antarctic sea ice?
Answers
The correct answer is Migrating farther into the sea
Explanation:
The Adálie penguins rely on ice sheets to obtain food as the krill they feed on is only found underside of the ice. This implies as the Antarctic sea ice melts Adálie penguins need to look for new places to find krill as if there are no ice sheets there are no krill for these penguins. Due to this, it is likely these penguins are forced to migrate or move farther into the sea to survive because it is likely in these zones there are ice sheets and therefore places where they can find krill. Despite this, this process might lead to a significant decline in the population of penguins due to the competence for food and the process of migration itself. Thus, the one that would help Adáline penguins to survive during the melting of Antarctic sea ice is migrating farther into the sea.
Have a nice day! :)
The Adálie penguins feed on krill that live on the underside of ice sheets. Adálie penguins survive during the melting of Antarctic sea ice help migrating farther into the sea. Therefore, option A is correct.
What is migration ?The term migration is defined as the movement of either people or animals from one area to another.
The Adálie penguins rely on ice sheets for food because the krill they eat is only found on the underside of the ice. As a result, it is likely that these penguins are forced to migrate or move further into the sea to survive.
Regardless, this process may result in a significant decline in penguin population due to food competence and the migration process itself.Thus, the one that will assist Adáline penguins in surviving during the melting of Antarctic sea ice is migrating deeper into the sea.
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Your question is incomplete,most probably your question was
The Adálie penguins feed on krill that live on the underside of ice sheets. Which of the following would help Adálie penguins survive during the melting of Antarctic sea ice? Migrating farther into the sea Breeding during summer months Growing strong toe nails to grip ice Spending more time raising their young
What is ΔH∘rxn for the following chemical reaction? CO(g)+NH3(g)→HCN(g)+H2O(g) You can use the following table of standard heats of formation (ΔH∘f) to calculate the enthalpy of the given reaction.
Answers
45.1KJ is the enthalpy of the given reaction.
The formation reaction of CO,NH3,HCN,H2O are-
C+ 1/2 O2 =CO,ΔH=-110.5KJ1/2 N2 + 3/2 H2 = NH3,ΔH=-45.90KJ1/2 H2 + 1/2 N2 +C = HCN, ΔH=130.5KJH2 + 1/2 O2 = H2O, ΔH= -241.8KJThus to attain the given equilibrium we reverse the equation 1 and 2 the add with 3 and 4. So ΔH of total reaction is 45.1KJ.
What is standard enthalpy of reaction?
The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.
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