Question 1

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? ___ PCl₃(l)+ ___ H₂O(l)→ ___ H₃PO₃(aq)+ ___ HCl(aq)

Accepted Answer

To balance the equation, we need to ensure that both sides have an equal number of atoms of each element. Since there is only one H on the reactant side and 2 H's on the product side, we need to multiply the coefficient of H₂O by 2. Similarly, there are 13 Cl's on each side, so we do not need to adjust the coefficient of PCl₃. Therefore, the balanced equation is: PCl₃(l) + 2H₂O(l) → H₃PO₃(aq) + HCl(aq) The coefficient of H₂O is 2, so the answer is C.

Question 2

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Al + ___ H₂SO₄ → ___ Al₂(SO₄)₃ + ___ H₂

Accepted Answer

The balanced equation is 2 Al + 3 H2SO4 → Al2(SO4)3 + 3 H2, summing up the coefficients gives 2 + 3 + 3 = 8, plus 1 for the implied coefficient of Al2(SO4)3, totaling 9.

Question 3

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Na + ___ H₂O → ___ NaOH + ___ H₂

Accepted Answer

The equation is properly balanced as: 2 Na + H2₂O → 2 NaOH + H2₂ Therefore, the coefficient of H2O is 0, and the coefficient of H2₂O is 1. Thus, the answer is B) 2.

Question 4

Balance the following equation: C₈H₁₈O₃(l)+ O₂(g)→ H₂O(g)+ CO₂(g)

Accepted Answer

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Question 5

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? ___ CH₃OH + ___ O₂ → ___ CO₂ + ___ H₂O

Accepted Answer

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Question 6

What is the empirical formula for a 100-g sample containing 87.42 g of nitrogen and 12.58 g of hydrogen?

Accepted Answer

1. Find the moles of each element: 
- Moles of N = 87.42 g / 14.01 g/mol = 6.24 mol 
- Moles of H = 12.58 g / 1.008 g/mol = 12.48 mol

2. Divide each number of moles by the smaller number of moles to get a ratio: 
- N: 6.24 mol / 6.24 mol = 1 
- H: 12.48 mol / 6.24 mol = 2

3. Check if the ratio can be simplified. In this case, it cannot. The empirical formula is therefore NH2, which is choice C.

Question 7

Balance the following equation: Ca₃(PO₄)₂(s)+ SiO₂(s)+ C(s)→ CaSiO₃(s)+ CO(g)+ P₄(s)

Accepted Answer

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Question 8

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Al₄C₃ + ___ H₂O → ___ Al(OH)₃ + ___ CH₄

Accepted Answer

The balanced equation is Al4C3 + 12 H2O → 4 Al(OH)3 + 3 CH4, so the coefficient of H2O is 12.

Question 9

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ CH₄ + ___ Cl₂ → ___ CCl₄ + ___ HCl

Accepted Answer

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Question 10

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C₁₈H₃₆O₂ + __ O₂ → __ CO₂ + __ H₂O

Accepted Answer

Balancing the equation, we need 26 molecules of oxygen to react with 1 molecule of the fatty acid. Therefore, the coefficient preceding O₂ is 26.

Question 11

What is the name given to the quantitative relationship between the substances that are consumed and produced in a chemical reaction?

Accepted Answer

The name given to the quantitative relationship between the substances that are consumed and produced in a chemical reaction is stoichiometry. The other options, such as the law of definite proportions and percent composition, relate to specific aspects of chemical reactions but do not encompass the entirety of the quantitative relationship.

Question 12

When a chemical equation is balanced,it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? ___ C₇H₁₄ + ___ O₂ → ___ CO₂ + ___ H₂O

Accepted Answer

To balance the combustion reaction, we need to ensure that the number of carbon and hydrogen atoms are equal on both sides of the equation. We can start by balancing the carbon atoms first. There is one carbon atom on each side of the equation, so we do not need to adjust the coefficient for the hydrocarbon. The number of hydrogen atoms is 2 on the reactant side and 12 on the product side, so we need to multiply the coefficient for the hydrocarbon by 6 to balance the hydrogen atoms: 
___ CS1U1B17S1U1B0HS1U1B114S1U1B0 + ___ OS1U1B12S1U1B0 --> ___ COS1U1B12S1U1B0 + 6___HS1U1B2S1U1B0O
Now, we can balance the oxygen atoms by adding the appropriate coefficient for O2: 
___ CS1U1B17S1U1B0HS1U1B114S1U1B0 + 9O2 --> ___ COS1U1B12S1U1B0 + 6___HS1U1B2S1U1B0O
We can simplify the coefficients by dividing by 3: 
___ CS1U1B17S1U1B0HS1U1B38S1U1B0 + 3O2 --> ___ COS1U1B4S1U1B0 + 2___HS1U1B2S1U1B0O
Therefore, the coefficient for the hydrocarbon is 6, which is equivalent to B in the answer choices.

Question 13

Balance the following equation for the combustion of benzene: C₆H₆(l)+ O₂(g)→ H₂O(g)+ CO₂(g)

Accepted Answer

This choice balances the equation with the correct coefficients for all elements present in the reactants and products. The coefficients are the smallest whole numbers that balance the equation, and they follow the law of conservation of mass.

Question 14

Balance the following equation: UO₂(s)+ HF(l)→ UF₄(s)+ H₂O(l)

Accepted Answer

The balanced chemical equation is: UO₂(s) + 4HF(l) → UF₄(s) + 2H₂O(l). This equation conserves both atoms and charges on both sides of the equation. Option B is the only one that balances the equation correctly.

Question 15

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Cr + ___ H₂SO₄ → ___ Cr₂(SO₄)₃ + ___H₂

Accepted Answer

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Question 16

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? ___ Ca₃(PO₄)₂ + ___ H₂SO₄ → ___ CaSO₄ + ___ H₃PO₄

Accepted Answer

The answer of What is the coefficient of H₂SO₄ when...

Question 17

Balance the following equation: B₂O₃(s)+ HF(l)→ BF₃(g)+ H₂O(l)

Accepted Answer

The correct balancing of the equation involves 6 HF molecules reacting with the solid to produce 2 BF3 gas molecules and 3 H2O liquid molecules, maintaining the law of conservation of mass.

Question 18

Calculate the molar mass of sulfuric acid.

Accepted Answer

The molar mass of sulfuric acid (H2SO4) can be calculated by finding the sum of the atomic masses of each individual element, multiplied by the number of atoms present in the molecule. 
Atomic mass of H = 1.008 
Number of H atoms = 2 
Atomic mass of S = 32.06 
Number of S atoms = 1 
Atomic mass of O = 15.999 
Number of O atoms = 4 
Molar mass = (2 x 1.008) + (1 x 32.06) + (4 x 15.999) = 98.086 g/mol

Question 19

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? __ C₂H₄ + __ O₂ → __ CO₂ + __ H₂O

Accepted Answer

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Question 20

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) __ SF₄ + __ H₂O → __ H₂SO₃ + __ HF

Accepted Answer

The balanced equation is: 4SF₄ + 6H₂O → 4H₂SO₃ + 3HF The sum of the coefficients is: 4 + 6 + 4 + 3 = 17, which gives us choice D as the correct answer.

Quiz 3: Stoichiometry Ratios of Combination

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ PCl₃(l) + _ H₂O(l) → _ H₃PO₃(aq) + _ HCl(aq)

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ Al + _ H₂SO₄ → _ Al₂(SO₄) ₃ + _ H₂

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? _ Na + _ H₂O → _ NaOH + _ H₂

Balance the following equation: C₈H₁₈O₃(l) + O₂(g) → H₂O(g) + CO₂(g)

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? _ CH₃OH + _ O₂ → _ CO₂ + _ H₂O

What is the empirical formula for a 100-g sample containing 87.42 g of nitrogen and 12.58 g of hydrogen?

Balance the following equation: Ca₃(PO₄) ₂(s) + SiO₂(s) + C(s) → CaSiO₃(s) + CO(g) + P₄(s)

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? _ Al₄C₃ + _ H₂O → _ Al(OH) ₃ + _ CH₄

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ CH₄ + _ Cl₂ → _ CCl₄ + _ HCl

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ → CO₂ + H₂O

What is the name given to the quantitative relationship between the substances that are consumed and produced in a chemical reaction?

When a chemical equation is balanced,it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ → _ CO₂ + _ H₂O

Balance the following equation for the combustion of benzene: C₆H₆(l) + O₂(g) → H₂O(g) + CO₂(g)

Balance the following equation: UO₂(s) + HF(l) → UF₄(s) + H₂O(l)

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ Cr + _ H₂SO₄ → _ Cr₂(SO₄) ₃ + _H₂

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? _ Ca₃(PO₄) ₂ + _ H₂SO₄ → _ CaSO₄ + _ H₃PO₄

Balance the following equation: B₂O₃(s) + HF(l) → BF₃(g) + H₂O(l)

Calculate the molar mass of sulfuric acid.

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? C₂H₄ + O₂ → CO₂ + H₂O

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) SF₄ + H₂O → H₂SO₃ + HF

Quiz 3: Stoichiometry Ratios of Combination

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ PCl3(l) + ___ H2O(l) → ___ H3PO3(aq) + ___ HCl(aq)

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Al + ___ H2SO4 → ___ Al2(SO4) 3 + ___ H2

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Na + ___ H2O → ___ NaOH + ___ H2

Balance the following equation: C8H18O3(l) + O2(g) → H2O(g) + CO2(g)

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? ___ CH3OH + ___ O2 → ___ CO2 + ___ H2O

What is the empirical formula for a 100-g sample containing 87.42 g of nitrogen and 12.58 g of hydrogen?

Balance the following equation: Ca3(PO4) 2(s) + SiO2(s) + C(s) → CaSiO3(s) + CO(g) + P4(s)

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Al4C3 + ___ H2O → ___ Al(OH) 3 + ___ CH4

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ CH4 + ___ Cl2 → ___ CCl4 + ___ HCl

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 → __ CO2 + __ H2O

What is the name given to the quantitative relationship between the substances that are consumed and produced in a chemical reaction?

When a chemical equation is balanced,it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 → ___ CO2 + ___ H2O

Balance the following equation for the combustion of benzene: C6H6(l) + O2(g) → H2O(g) + CO2(g)

Balance the following equation: UO2(s) + HF(l) → UF4(s) + H2O(l)

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Cr + ___ H2SO4 → ___ Cr2(SO4) 3 + ___H2

What is the coefficient of H2SO4 when the following equation is properly balanced with the smallest set of whole numbers? ___ Ca3(PO4) 2 + ___ H2SO4 → ___ CaSO4 + ___ H3PO4

Balance the following equation: B2O3(s) + HF(l) → BF3(g) + H2O(l)

Calculate the molar mass of sulfuric acid.

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? __ C2H4 + __ O2 → __ CO2 + __ H2O

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) __ SF4 + __ H2O → __ H2SO3 + __ HF

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ PCl₃(l) + _ H₂O(l) → _ H₃PO₃(aq) + _ HCl(aq)

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ Al + _ H₂SO₄ → _ Al₂(SO₄) ₃ + _ H₂

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? _ Na + _ H₂O → _ NaOH + _ H₂

Balance the following equation: C₈H₁₈O₃(l) + O₂(g) → H₂O(g) + CO₂(g)

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? _ CH₃OH + _ O₂ → _ CO₂ + _ H₂O

Balance the following equation: Ca₃(PO₄) ₂(s) + SiO₂(s) + C(s) → CaSiO₃(s) + CO(g) + P₄(s)

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? _ Al₄C₃ + _ H₂O → _ Al(OH) ₃ + _ CH₄

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ CH₄ + _ Cl₂ → _ CCl₄ + _ HCl

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ → CO₂ + H₂O

When a chemical equation is balanced,it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ → _ CO₂ + _ H₂O

Balance the following equation for the combustion of benzene: C₆H₆(l) + O₂(g) → H₂O(g) + CO₂(g)

Balance the following equation: UO₂(s) + HF(l) → UF₄(s) + H₂O(l)

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ Cr + _ H₂SO₄ → _ Cr₂(SO₄) ₃ + _H₂

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? _ Ca₃(PO₄) ₂ + _ H₂SO₄ → _ CaSO₄ + _ H₃PO₄

Balance the following equation: B₂O₃(s) + HF(l) → BF₃(g) + H₂O(l)

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? C₂H₄ + O₂ → CO₂ + H₂O

Once the following equation is balanced with the smallest set of whole number coefficients,what is the sum of the coefficients? (Don't forget to include coefficients of one.) SF₄ + H₂O → H₂SO₃ + HF