Question 4 (1 point)
At atom has 18 protons, 17 neutrons, and 18 electrons. What is the overall charge?

A. -1
B. 0
C.+1
D. +2

Answer:

-70.87 kJ

Explanation:

Let's consider the following balanced equation.

1/2 O₂(g) + SO₂(g) ⇄ SO₃(g)

We can calculate the standard Gibbs free energy of reaction (ΔG°r) from the standard Gibbs free energies of formation (ΔG°f) using the following expression.

ΔG°r = 1 mol × ΔG°f(SO₃(g)) - 1/2 mol × ΔG°f(O₂(g) - 1 mol × ΔG°f(SO₂(g))

ΔG°r = 1 mol × (-371.06 kJ/mol) - 1/2 mol × 0 kJ/mol - 1 mol × (-300.194 kJ/mol)

ΔG°r = -70.87 kJ

Their Net profit is  $75,000.

Net profits is synonymous with profit since it represents the final measure of profitability for an employer. internet profits are also referred to as internet income because it represents the net quantity of earnings closing in any case prices and charges are subtracted from sales.

Gross profit is the income this is left after production charges have been subtracted from revenue and help investors determine how an awful lot income a company earns from the production and sale of its products. by using evaluation, net income, or net earnings, is the income this is left in any case costs and fees had been removed from sales. It allows displaying of an organization's average profitability, which displays the effectiveness of an enterprise's management.

received amount of past month =  $300,000

Operating cost = $125,000

Gross profit = $200,000

Therefore, net profit = $200,000 - $125,000

                                  =   $75,000

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Answer: Chromium is less reactive as compared to Aluminium as it can not easily electrons as aluminium.

Explanation:

The arrangement of metals in a series according to the decreasing order of their reactivity is called reactivity series.

The metals that are placed above hydrogen are more reactive and those below hydrogen are less reactive.

A metal placed above another metal can displace lower metal from its salt solution. Thus a metal placed above in series is more reactive than metals placed below it.

As aluminium can easily lose electrons as compared to chromium , it is more reactive than Chromium.

The empirical formula of the compound is C₂H₁₆S₂N₃O.

The moles of each element is as follows::

For CO₂:

Carbon (C) has a molar mass of 12.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of C in CO₂ = 2.08 g / 12.01 g/mol = 0.173 moles

Moles of O in CO₂ = 2.08 g / 16.00 g/mol = 0.130 moles

For H₂O:

Hydrogen (H) has a molar mass of 1.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of H in H₂O = 1.28 g / 1.01 g/mol = 1.27 moles

Moles of O in H₂O = 1.28 g / 16.00 g/mol = 0.080 moles

For SO₃:

Sulfur (S) has a molar mass of 32.06 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of S in SO₃ = 4.77 g / 32.06 g/mol = 0.149 moles

Moles of O in SO₃ = 4.77 g / 16.00 g/mol = 0.298 moles

For HNO₃:

Hydrogen (H) has a molar mass of 1.01 g/mol.

Nitrogen (N) has a molar mass of 14.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of H in HNO₃ = 3.48 g / 1.01 g/mol = 3.45 moles

Moles of N in HNO₃ = 3.48 g / 14.01 g/mol = 0.248 moles

Moles of O in HNO₃ = 3.48 g / 16.00 g/mol = 0.217 moles

The simplest whole-number ratio of the elements will be:

Carbon: 0.173 moles / 0.080 moles ≈ 2.16

Hydrogen: 1.27 moles / 0.080 moles ≈ 15.88

Sulfur: 0.149 moles / 0.080 moles ≈ 1.86

Nitrogen: 0.248 moles / 0.080 moles ≈ 3.10

Oxygen: 0.080 moles / 0.080 moles = 1

Therefore, the empirical formula is C₂H₁₆S₂N₃O.

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The incorrect steps to do a complete stoichiometric calculation is option C which is Write the dimensional analysis because it does not entails the reactions between the reactants and the products.

Stoichiometric calculations are calculations that are done in chemistry between the reactants and products which includes balancing of equations, conversation of moles in the reactants and products, evaluation of moles in the reactants and so on.

Therefore, The incorrect steps to do a complete stoichiometric calculation is option C which is Write the dimensional analysis because it does not entails the reactions between the reactants and the products.

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Answer:

This is a ratio of two small integers, 1.500 = 3:2. Let's assume that in the molecule of ferrous oxide there is one oxygen atom and one iron atom, and the ratio of the mass of the oxygen atom to the mass of the iron atom is 0.2865.

Explanation:

Molecular weight of Iron (II) oxide= FeO Molecular weight of Iron (III) oxide= Fe2O3

In FeO , every one iron atom contains one oxygen atom.

In Fe2O3, every one iron atom contains 1.5 oxygen atoms.

So FeO(II) will contain more Iron than FeO(III).

Calculation of percentage of iron is not necessary. I think this argument

alone is enough to prove this.

However on calculating the % of Fe, in FeO and Fe2O3 we get,

% of Iron in FeO= 55.85/(55.85+16) =55.85/71.85= 77.73%

% of Iron in Fe2O3= (2 x55.85)/(111.7+48)

=111.7/159.48 = 69.94%

Answer: A) H-H is least polar

Explanation:

Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself. The more is the difference in electronegativity, the more polat the bond is.

1. H-H : Electronegativity difference = electronegativity of hydrogen - electronegativity of hydrogen =2.1 -2.1= 0

2.   H-Cl : Electronegativity difference = electronegativity of chlorine - electronegativity of hydrogen = 3-2.1 = 0.9

3. H-F : Electronegativity difference  = electronegativity of fluorine - electronegativity of hydrogen= 4-2.1= 1.9  

4.   H-I : Electronegativity difference = electronegativity of iodine - electronegativity of hydrogen= 2.5 -2.1= 0.4

Thus the least electronegativity difference between the bonded atoms is in H-H , this is least polar.

Answer:

1

Explanation:

Answer:

NH3 - nitrogen trihydride

Explanation:

In attempting to answer this question we should keep certain things in mind. We should remember that the subscripts show the number of atoms of each element present in the compound and we do not use the prefix "mono" twice in naming a binary compound.

The prefixes "mono", "di" etc are used when the central atom in the compound can form more than one compound with the same atom; E.g carbon monoxide and carbon dioxide. Hence the description, monohydrogen monobromide is incorrect.

Also, SiF4 is silicon tetrafluoride and not silicon tetrafluorine.

Hence, only NH3 was correctly described as nitrogen trihydride.

Answer:

B

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 9.033×10²³ is the number of molecules in 1.500 mole of H\(_2\)O.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)

number of moles =1.500 mole

substituting all the given values in the above equation, we get

number of atoms/molecules=1.500  × 6.022×10²³(Avogadro number)

number of atoms/molecules =9.033×10²³molecules

Therefore, 9.033×10²³ is the number of molecules in 1.500 mole of H\(_2\)O.

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Answer:

1178J is the heat of the reaction

Explanation:

Assume that the reaction mixture has a density of 1.00 g/mL and a specific heat of 4.184 J/g-oC. The calorimeter has a heat capacity of 10.0 J/oC

The heat of a reaction follows the equation:

Q = m*S*ΔT

Where Q is the heat of the reaction,

m is the mass:

61.2mL * (1.00g/mL) = 61.2g

S is specific heat = 4.184J/g°C

ΔT = 4.6°C

Replacing:

Q = 61.2g*4.184J/g°C*4.6°C

Q = 1178J is the heat of the reaction

Answer:

1°C rise in temperature is equal to a rise of 59°F

Answer:

Hence 1℃ rise in temperature is equal to the rise in 59℉.

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Phosphorus triiodide is a nonpolar molecule.

We have to note that the polarity of a molecule would have a lot to do with the shape of the molecule. In other words, the arrangement of the atoms in the molecules tell us if the molecule would be polar or not.

The three iodine atoms are symmetrically positioned around the center phosphorus atom because the molecule has a trigonal pyramidal structure. As a result, the three P-I bonds' respective dipole moments cancel out and provide a net dipole moment of zero.

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It occurs in oxygen I think

Answer:

\(Q=-71.1kJ\)

Explanation:

Hello!

In this case, since the formation of ammonia by starting with nitrogen and therefore hydrogen is:

\(N_2+3H_2\rightarrow 2NH_3\)

Which has an energy of reaction of:

\(\Delta _fH_{NH_3}=-45.90 \frac{kJ}{molNH_3}\)

We can compute the energy required for this reaction by first computing the moles of ammonia yielded by 21.7 grams of nitrogen (28.02 g/mol) via stoichiometry:

\(n_{NH_3}=21.7gN_2*\frac{1molN_2}{28.02gN_2}*\frac{2molNH_3}{1molN_2}=1.55molNH_3\)

Thus, the energy turns out:

\(Q=n_{NH_3}\Delta _fH_{NH_3}=1.55molNH_3 * -45.90 \frac{kJ}{molNH_3}\\\\Q=-71.1kJ\)

Best regards!

Answer: 71.1 (Edmentum)

Explanation:

Answer:

Mass of Cr = 0.25376 gram

Moles of Fe = 0.0011875

Mass of Te = 0.05472 gram

Moles of Ti = 7.9764

Explanation:

Given:

Elements     Moles      Mass

Cr               0.00488

Fe                                66.5 mg = 0.0665

Ti                 48

Hg                                1.60 kg = 1600

Computation:

Mass = Atomic mass x moles

Moles = Mass / Atomic mass

Atomic mass

Cr = 52 u        

Fe = 56 u                        

Te = 127.6 u  

Hg = 200.59 u

Mass of Cr = 0.00488 x 52

Mass of Cr = 0.25376 gram

Moles of Fe = 0.0665 / 56

Moles of Fe = 0.0011875

Mass of Te = 1.14 x 10⁻³ x 48

Mass of Te = 0.05472 gram

Moles of Ti = 1600 / 200.59

Moles of Ti = 7.9764

Answer:

176 g of CO₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2C₂H₂ + 5O₂ —> 4CO₂ + 2H₂O

Next, we shall determine the mass of C₂H₂ that reacted and the mass of CO₂ produced from the balanced equation.

This is illustrated below:

Molar mass of C₂H₂ = (2×12) + (2×1)

= 24 + 2 = 26 g/mol

Mass of C₂H₂ from the balanced equation = 2 × 26 = 52 g

Molar mass of CO₂ = 12 + (2×16)

= 12 + 32 = 44 g/mol

Mass of CO₂ from the balanced equation = 4 × 44 = 176 g

From the calculations made above,

52 g of C₂H₂ reacted to produce 176 g of CO₂.

Answer:Yes

Explanation:

Because Chinstrap penguins eat krills

Answer:

43.5

Explanation:

Hope that helps

The total number of moles of electrons lost by Mg(s) when 2.0 moles of electrons are gained by Ni2+(ag) is also 2.0 moles of electrons.

This is because in a chemical equation, the number of moles of electrons gained by the reducing agent (in this case Ni2+) is equal to the number of moles of electrons lost by the oxidizing agent (in this case Mg(s)).

In this redox reaction, Mg is being oxidized because it loses electrons and Ni is being reduced because it gains electrons. The oxidation and reduction process are occurring simultaneously, so the number of electrons lost by Mg(s) is equal to the number of electrons gained by Ni2+(ag).

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The electrons that are gained by the \(Ni^{2+}\) ion is 2.0 moles of electrons.

We know that when there is a redox reaction, there would be the loss or gain of electrons in the process. The process is a simultaneous one so the electrons that are lost by one specie must as a matter of necessity be gained by another specie.

In this case, as we look at the reaction equation we can see that there are two electrons that have been lost by the magnesium atom and these two electrons would be gained by the Nickel II ion.

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Answer:

2

Explanation:

so let say 5.0/100×40

that is 2

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The percent by mass is the estimation of the solute present in the solution or the substance. The percent by mass of 5 gm solute is calculated to be 11.11%.

The percent by mass is defined as the division of the mass of the solute of the element by the mass of the compound or the solution as the whole. The formula for percent by mass is given as:

mass percent = (mass of solute ÷ total mass of compound or solution) x 100%

The mass of the solute has been the numerator and the mass of the solution has been the denominator that must be multiplied by 100 to get the percent by mass or mass percentage. It is represented using %.

Given,

Mass of solute = 5.00 grams

Mass of compound (solution) = solute + water

= 40.0 grams + 5.00 grams

= 45.00 grams

Substituting the values above as:

mass percent = (mass of solute ÷ total mass of compound or solution) x 100%

The percent by mass = (5.00 ÷ 45.00) x 100%

= 11.11 %

Therefore, 11.11 % is the percent by a mass of 5.00-gram solute dissolved in 40.0 grams of water.

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Answer:

This question appears incomplete

Explanation:

This question appears incomplete because the data provided only makes it possible to calculate the certainty of the acetic acid content per total volume of the vinegar. Thus, the 4% means for every 100 mL of the vinegar, there is 4 mL of acetic acid present. To calculate the volume of acetic acid in any other volume of vinegar, the formula will be

volume of acetic acid = 4/100 × total volume of vinegar

Answer:

answering so the person who wanted brainliest can get it :D

<3

Answer:  A from the burial and decomposition of plant material.

Explanation:

Answer: 89.4 kJ

Explanation:

The production of iron and carbon dioxide from iron oxide and carbon monoxide is an exothermic reaction. which expression can you use to find how many kilojoules of heat are produced when 3.40 mol Fe₂O₃ reacts with an excess of CO? ΔH = +26.3 kJ The amount of heat produced will be, 89.4 kJ

Hope this helps :D

The production of iron and carbon dioxide from iron oxide and carbon monoxide is an exothermic reaction.

Which expression can you use to find how many kilojoules of heat are produced when 3.40 mol Fe₂O₃ reacts with an excess of CO. ΔH = +26.3 kJ The amount of heat produced will be, 89.4 kJ.

Chemical reactions with a negative H are known as exothermic reactions because they generate heat. Exothermic processes include those that include neutralization, the Haber process, thermite, and combustion.

An endothermic reaction is the opposite of an exothermic process. Endothermic reactions generate less heat than they take in from their surroundings. Exergonic and endergonic reactions are subtypes of exothermic and endothermic reactions, respectively.

Therefore, The production of iron and carbon dioxide from iron oxide and carbon monoxide is an exothermic reaction.

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Answer:

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The mass percentage of HCl 11,900x/118 g and molality of solution is   9.915 mol L^-1.

Molarity = 11.8 M

Molarity = (moles of HCl) / (litres of solution)

Molality = (moles of HCl) / (kilograms of solvent)

=> Let number of moles of HCl present be x moles.

So, 11.8 = x/litres of solution

litres of solution = x/11.8 litres.

So, volume in mL = x/11.8 * 1000 mL =>10,000x/118 mL

Density of solution = 1.19 g/ml

So, D = m/v

Mass of solution = D * v => 1.19 * 10,000x/118 => 11,900x/118 g

=> (11,900x/118)/1000 L => 11.9x/118 litres

Moles of HCl = x moles.

Molality = x/( 11.9x/118)

=> 118x/11.9x => 118/11.9 => 9.9156 mol L-1

=> Molality of solution = 9.915 mol L-1 (approx.)

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