A student measured the weight of a can of soda and found that it weighed 390.03 g. After emptying the can and carefully washing and drying it the can alone is weighed at 14.90 g. Using these two values we can determine the mass of the soda in the can. What is the mass of the soda alone

Answer:

The balanced reaction for the decomposition of baking soda is

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

We can find the heat of reaction by using the Hess' Law. This is done by using this formula:

∑(Hf,products) -∑(Hf,reactants) = Heat of reaction

where Hf is the heat of formation. According to literature, these are the heats of formation for each of the compounds in the reaction:

NaHCO3: -947.68 kJ/mol

Na2CO3: -1130.94 kJ/mol

CO2: -393.51 kJ/mol

H2O: -241.8 kJ/mol

Applying Hess' Law:

[1(-1130.94) + 1(-241.82)] + 1(-393.51)] - [2(-947.68)] = 129.09 kJ

Thus, the heat of reaction is 129.09 kJ/mol NaHCO3. Since there is 1.96 mol of NaHCO3, the total heat of reaction is 253.02 kJ

Explanation:

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Answer:

7,5km/h

Explanation:

Average speed = total distance travelled/time taken

Average speed = 15/2

Average speed = 7,5km/h

(This should be in physics/maths not Chemistry)

Answer: Carbon-12 and Carbon-14 both have the atomic number of 6.

Explanation: They are both isotopes of one another. This means they have different amount of neutrons, resulting in different atomic masses.

Answer:

They have the same atomic number.  Carbon has the atomic number of 6 which means that all isotopes have the same proton number. However, the number of neutrons is different, thus giving different mass numbers.

Explanation:

The percent yield of the experimentally produce 3.65 grams of copper when 1.87 grams of aluminium reacted with 9.65 grams of copper (ii) sulfate is 95.30%.

To calculate the percent yield, we first need to determine the theoretical yield of copper produced from the given amounts of aluminium and copper (II) sulfate. We'll use the balanced chemical equation to do this:

2 Al + 3 CuSO₄ → Al₂(SO₄)₃ + 3 Cu

First, find the moles of aluminium (Al) and copper (II) sulfate (CuSO₄) using their molar masses:

Al: 1.87 g / 26.98 g/mol = 0.0693 mol

CuSO₄: 9.65 g / 159.61 g/mol = 0.0605 mol

Determine the limiting reactant by dividing moles by the stoichiometric coefficients:

Al: 0.0693 mol / 2 = 0.03465

CuSO₄: 0.0605 mol / 3 = 0.02017

CuSO₄ is the limiting reactant as it has the lowest value.

Calculate the theoretical yield of copper (Cu) using the limiting reactant:

Theoretical yield of Cu: 0.02017 mol × 3 mol Cu / 1 mol CuSO₄ × 63.55 g/mol

= 3.83 g

Calculate the percent yield

Percent yield = (experimental yield / theoretical yield) × 100

Percent yield = (3.65 g / 3.83 g) × 100

= 95.30%

Thus, the percent yield of copper in this reaction is 95.30%.

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An isochron represents the age of a rock, given the composition of minerals. In geochronology, isochron dating is a technique used to determine the age of rocks or geological samples.

Isochron dating relies on analyzing the ratios of isotopes within the minerals present in the rock. Isotopes are variants of an element with different numbers of neutrons in their atomic nuclei. By measuring the isotopic ratios, specifically the parent and daughter isotopes, scientists can calculate the time elapsed since certain geological events, such as the crystallization of the rock or a metamorphic event.

The isochron method involves plotting the isotopic ratios on a graph, typically using a set of minerals from the same rock sample. If the minerals formed at the same time, the data points will fall along a straight line known as an isochron. The slope of the isochron line provides the age of the rock, while the intercept with the y-axis indicates the initial isotopic composition. This technique helps to overcome challenges such as the presence of inherited isotopes or disturbances in the isotopic system, providing a reliable estimate of the rock's age.

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Answer:

3 valence electrons

Explanation:

Because aluminum has three, that means three fluorines can bond. The make the formula AlF3, also known as aluminum trifluoride. Each of the fluorine atoms gets an electron to fill their shell, and the aluminum loses three, giving it a filled shell too (remember, aluminum has three extra electrons).

It is as critical for your tap water to be a good buffer as it is for the water at the nearest lake to be a good buffer.

A  buffer is a solution that resists changes in acidity and alkalinity. The pH of a buffer does not change easily hence it stabilizes a solution.

It is important to know that water in a lake ought to be buffered because of the survival of organisms in after that can not tolerate a sudden change in pH.

As such the bodies of living organism also need to maintain a delicate pH balance. Hence, it is as critical for your tap water to be a good buffer as it is for the water at the nearest lake to be a good buffer.

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The container contains about 0.697 molecules of CH4 gas.

We must apply the Gas Laws, whose says that PV = nRT, wherein P is just the pressures, Divided by the volume, n represents the size of molecules, R is the classical physics characteristic, and T is the absolute temperature in kelvin, to determine how many moles of CH4 gas are contained in the container.

The temperature must first be converted to Celsius to Kelvin using the formula: 47°C Plus 273.15 Equals 320.15 K.

The molar mass can then be determined using the Ideal Gas Law:

n = (PV)/(RT) = (0.497 as of now * 3.7 L)/(0.0821/molK * 320.15 K) ≈ 0.697 pinches

Therefore, the amount of CH4 methane in the container is roughly 0.697 moles.

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ClO3-: The chlorine atom carries a single negative charge.

ClO4-: The chlorine atom carries a single negative charge.

NO3-:The nitrogen atom does not carry any charge, and the molecule as a whole carries a single negative charge.

Certainly! Here are the drawings of the molecules you requested:

1. ClO3-

   O

    |

Cl - O

    |

   O [-

2. ClO4-

   O

    |

Cl - O

    |

   O

    |

   O [-

3. NO3-

   O

    ||

N - O

    |

   O [-

4. SO3

 O

 ||

S - O

 ||

 O

Please note that for SO3, it does not carry any charge (neutral molecule), as requested.

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Answer:

hi

Explanation:

this is my first time on this app so what do i do

Answer:   Mechanical energy is the sum of kinetic and potential energy in an object.

We are given that At 2.5 seconds, the helicopter has a kinetic energy of 20 J, Also we know that Energy per time is called the power and is the rate of energy, therefore in order to find the mechanical energy at that time, we will simply divide the values, thus:

Mechanical energy is given as:

Explanation:

Organic molecules are more diverse compared to inorganic molecules due to the unique properties of carbon, its ability to form covalent bonds with other elements, and the presence of functional groups, allowing for a wide range of molecular structures and chemical reactions.

Organic molecules are primarily composed of carbon atoms, which possess a unique ability to form strong covalent bonds with other atoms, including carbon itself. Carbon atoms can bond with up to four other atoms, enabling the formation of complex and varied molecular structures. This property, known as catenation, allows carbon to form long chains, branched structures, and ring systems, resulting in an immense diversity of organic compounds.

Furthermore, carbon atoms can also bond with other elements such as hydrogen, oxygen, nitrogen, sulfur, and phosphorus, forming functional groups. These functional groups significantly influence the chemical behavior and reactivity of organic molecules. They introduce specific characteristics and properties, such as acidity, basicity, polarity, and the ability to undergo various types of reactions. The presence of functional groups further expands the possibilities for molecular diversity in organic compounds.

In contrast, inorganic molecules typically lack the same level of structural complexity and diversity found in organic molecules. While inorganic compounds can exhibit a range of chemical properties and reactions, they are often limited by the nature of their bonding and the types of elements involved. Inorganic molecules predominantly involve ionic bonding, where electrons are transferred between atoms, resulting in simpler and more repetitive structures

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Answer:

tin (IV) oxide octahydrate contains 8 part water

What is the percent composition of water found in tin (IV) oxide octahydrate?

Answer:

region 2 and region 3

Explanation:

you can tell by the color of the land my friends^^

Answer:

2, 3 They are closest to the equator, and the equator marks to hottest places on earth.

Explanation:

I hope this helps you.

280.53 L is the final volume in liters.

Applying the ideal gas equation for O₂

    PV = nRT  

where P is pressure, V is volume, n is the number of moles of gas, R is gas constant and T is temperature

As n and T are not changing

So,  

    P₁V₁ = P₂V₂  ⇒equation 1

now from the question we have,

Given data;

    P₁ = 20.8 atm, P₂= 2.70 atm

    V₁ = 26.3 L

now we have to find the volume of a gas when pressure is changed.

V₂ = ?  

Put values in equation 1

    20.8 × 26.3 = 2.70 × ?

     V₂ = 20.8 × 26.3 / 2.70

     V₂ = 280.53 L  

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The result based on the number of significant figures is 8.9.

The term significant figures refers to the number of nonzero digits that can be given a particular place value in a problem. In the case of this problem we know that the answer must have the least number of place values.

As such, we have the number 5.87998+3.100 and the result based on the number of significant figures is 8.9.

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Solution,

Mass of Mg - 21gm

molar mass of Mg - 24gm

moles = Given mass/ Molar mass

moles = 21/24 = 0.875

1 mole of Mg produce 1 mole of H2 gas

so 0.875 mole of Mg will produce 0.875 moles of H2 gas

One mole of H2 gas = 22.4 litre

0.875 mole of H2 gas = 0.875×22.4

0.875 mole of H2 gas = 19.60 litre

So the nearest ANSWER is Option four 19.37 litre.

STP is the standard temperature and the pressure of the gases of the system. The volume of the hydrogen that will be produced as STP is 19.37 litres.

Volume is the amount of the substance or the solution occupied in an area or object and is estimated in L or mL. It is a scalar quantity.

Given,

Mass of magnesium = 21 gm

Molar mass of magnesium = 24 gm/mol

Moles of magnesium can be calculated as,

\(\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\;mass}\\\\&= \dfrac{21}{24}\\\\&= 0.875 \;\rm mol\end{aligned}\)

If 1-mole magnesium = 1-mole hydrogen gas

Then 0.875-mole magnesium = 0.875 moles of hydrogen gas

If 1 mole of hydrogen gas = 22.4 L

Then, 0.875 moles of hydrogen gas = x L

Solving for x:

\(\begin{aligned}\rm x &= 0.875 \times 22.4\\\\&= 19.60 \;\rm litre\end {aligned}\)

Therefore, the volume of hydrogen at STP would be option 4. 19.37 litres.

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Exothermic Reaction preferred for this reaction.

In the exo product, the pair of hydrogens on the diene ends up cis to the pair of hydrogens on the dienophile when the rings become fused. In the endo product, the opposite is true: the pair of hydrogens on the diene come out trans to the pair of hydrogens on the dienophile when the rings fuse together.

Exo And Endo Diels-Alder Products Are Diastereomers Of Each Other.These two products are stereoisomers. But since they are not non-superimposable mirror images (i.e. not enantiomers), they are diastereomers.These two molecules can be separated due to the fact that they have different physical properties.

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

It represents an amine group.

Answer:

Cells are made of several parts that work together.

Explanation:

It is this because bacteria are made of 1 cell, unicellular. All living things do not have to have more than 1 cell proven by bacteria which has one cell. And cells are living meaning it has to make up living things.

Hope this helps:)

Answer:

Option 3

Explanation:

Cells are made up of several parts (Organelles) that work together resulting in the functioning of the cell which further results in the functioning of the whole body.

Given configuration

\(\\ \bull\leadsto 1s^22s^22p^63s^23p^5\)

In the design of a new baby diaper, the manufacturer uses two polymers. The polymer that is best suited to the outside of the diaper is polymer I and to the inside is polymer II

Polymers are large molecules made by bonding (chemically linking) a series of building blocks or smaller units called monomers. The word polymer comes from the Greek words for “many parts.”

Polymers don’t have a definite length. They usually don’t form crystals, either. Finally, they usually don’t have a definite melting point

Monomers used to create polymer I is a dicarboxylic acid and for polymer II is an alkene.

They undergo addition polymerization.

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615 mmHg is equal to 1 atm and 101.325 kPa

From the problem statement, this is a conversion problem. We are asked to convert from units of mmHg to units atm and units of kPa. To do this, we need a conversion factor which would relate the different units involved. We either multiply or divide this certain value to the original measurement depending on what is asked. From literature, we will find that 1 atm is equal to 760 mmHg and it is also equal to 101.325 kPa. We do as follows:

615 mmHg (1 atm / 615 mmHg) = 1 atm

1 atm (101.325 kPa /1 atm ) = 101.325 kPa

Therefore, 615 mmHg is equal to 0.9869 atm and 101.325 kPa

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warm air rises because of convection.

A student holds the back of his hand near an iron to see if it's hot. The heat transfer is conduction.

Warm water moves throughout a mattress because of ... why is there warm water in a mattress again? Convection, I guess.

In a swimming pool, the water near the surface is warmer because of convection and solar radiation; it's closer to the Sun than the bottom of the pool, so it receives more thermal radiation, making it warmer.

They would be attracted with the uncharged object.

It occurs because of the electric field of negative and positive charges . The negative attracts positive ions of the uncharged object and the positive does the opposite one. Therefore, they attract with the uncharged object.

Answer: The charged objects will attract the uncharged object

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One action that is not typically part of the acute stroke pathway is "Surgical intervention." The primary goal of the acute stroke pathway is to quickly assess .

The common actions included in the acute stroke pathway typically involve:

Rapid recognition and activation: Recognizing the signs and symptoms of a stroke and activating the stroke team or emergency medical services (EMS).

Early assessment: Conducting a rapid assessment of the patient's neurological status and performing relevant diagnostic tests, such as brain imaging (e.g., CT scan).

Time-sensitive interventions: Administering time-sensitive treatments such as intravenous thrombolytic therapy (e.g., tissue plasminogen activator - tPA) or endovascular therapy (e.g., mechanical thrombectomy) in eligible cases.

Supportive care: Providing supportive care to manage symptoms, stabilize the patient, and prevent complications.

Transfer to specialized stroke unit: Arranging for the transfer of the patient to a specialized stroke unit or comprehensive stroke center for further evaluation and management.

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