Question 1

To the nearest whole number,the molar mass of Cu(NO₃)₂ is ________ g/mol.

Accepted Answer

The answer of To the nearest whole number,the molar mass...

Question 2

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of CO₂ and 0.1451 g of H₂O.What is the empirical formula of the compound?

Accepted Answer

The answer of Combustion analysis of an unknown compound containing...

Question 3

The balanced equation for the gaseous state oxidation of ammonia is shown below. 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O How many moles of O₂ are required to react with 1.2 mole of NH₃?

Accepted Answer

The answer of The balanced equation for the gaseous state...

Question 4

What is the molarity of a solution prepared by dissolving 0.80 g of NaOH in enough water to make 250 mL of solution?

Accepted Answer

The answer of What is the molarity of a solution...

Question 5

Oxygen can be produced from the catalytic decomposition of KClO₃ as shown in the balanced equation below. 2 KClO₃ → 2 KCl + 3 O₂ What is the percent yield if 3.20 grams of oxygen are formed from the reaction of 12.3 grams of KClO₃?

Accepted Answer

The answer of Oxygen can be produced from the catalytic...

Question 6

The fundamental SI unit for measuring matter is the ________.

Accepted Answer

The answer of The fundamental SI unit for measuring matter...

Question 7

Which one of the following is not an empirical formula?

Accepted Answer

The answer of Which one of the following is not...

Question 8

Ozone is unstable,decomposing to dioxygen,as shown in the balanced equation 2 O₃ → 3 O₂. In this reaction,how many grams of dioxygen can be formed from the decomposition of 96 grams of ozone?

Accepted Answer

The answer of Ozone is unstable,decomposing to dioxygen,as shown in...

Question 9

The number of grams in 0.333 mol of urea, (NH₂)₂CO,is ________.

Accepted Answer

The answer of The number of grams in 0.333 mol...

Question 10

The balanced equation for the reaction of acetylene,C₂H₂,and oxygen in an acetylene torch is 2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O. In this reaction the number of grams of oxygen required to react with 0.13 g of acetylene is ________.

Accepted Answer

The answer of The balanced equation for the reaction of...

Question 11

A balanced equation has the same numbers and kinds of ________ on both sides of the reaction arrow.

Accepted Answer

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Question 12

How many moles are in 7.8 g of acetamide,CH₃CONH₂?

Accepted Answer

The answer of How many moles are in 7.8 g...

Question 13

Combustion analysis of 1.200 g of an unknown compound containing carbon,hydrogen,and oxygen produced 2.086 g of CO₂ and 1.134 g of H₂O.What is the empirical formula of the compound?

Accepted Answer

The empirical formula calculation involves converting the masses of CO2 and H2O produced into moles of carbon and hydrogen, respectively. The mass of oxygen in the compound is found by subtracting the masses of carbon and hydrogen from the total mass of the compound. The moles of each element are then divided by the smallest number of moles to find the simplest whole number ratio of the elements in the compound. This leads to the empirical formula CH3O.

Question 14

When the reaction C₄H₁₀ + O₂ → CO₂+ H₂O is balanced using the smallest whole number coefficients,the coefficient in front of O₂ is ________.

Accepted Answer

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Question 15

The balanced equation for the decomposition of water is shown below. 2 H₂O → 2 H₂ + O₂ If 0.72 g of water react completely in this reaction,what is the theoretical yield of H₂?

Accepted Answer

The answer of The balanced equation for the decomposition of...

Question 16

When carbon dioxide dissolves in water,H+ is formed,which makes the solution acidic,as shown in the balanced equation below. CO₂ + H₂O → HCO₃^- + H⁺ What is the percent yield if 0.0088 g of CO₂ reacts with 900 g of H₂O to form 0.000108 g of H⁺?

Accepted Answer

The answer of When carbon dioxide dissolves in water,H+ is...

Question 17

When the reaction C₃H₈ + O₂ → CO₂ + H₂O is balanced,the total number of oxygen atoms in the balanced equation is ________.

Accepted Answer

The answer of When the reaction C₃H₈ + O₂ →...

Question 18

Ozone reacts with iodide ion as shown in the balanced equation below. O₃ + 2 I^- + H₂O → O₂ + I₂ + 2 OH^- In this reaction,how many grams of dioxygen can be formed from the reaction of 96 grams of ozone?

Accepted Answer

The answer of Ozone reacts with iodide ion as shown...

Question 19

If 4.0 g of H₂ react with 4.0 g of F₂ in the reaction shown below,what is the limiting reactant? H₂ + F₂ → 2 HF

Accepted Answer

The answer of If 4.0 g of H₂ react with...

Question 20

Hydrazine,N₂H₄,is used as a rocket fuel.In the reaction below,if 80.1 g of N₂H₄ and 92.0 g of N₂O₄ are allowed to react,which is the limiting reactant,and how many grams of excess reactant remain at the end of the reaction? 2 N₂H₄ + N₂O₄ → 3 N₂ + 4 H₂O

Accepted Answer

The answer of Hydrazine,N₂H₄,is used as a rocket fuel.In the...

Quiz 3: Formulas, equations, and Moles

To the nearest whole number,the molar mass of Cu(NO3)2 is ________ g/mol.

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 0.2845 g of CO2 and 0.1451 g of H2O.What is the empirical formula of the compound?

The balanced equation for the gaseous state oxidation of ammonia is shown below. 4 NH3 + 5 O2 → 4 NO + 6 H2O How many moles of O2 are required to react with 1.2 mole of NH3?

What is the molarity of a solution prepared by dissolving 0.80 g of NaOH in enough water to make 250 mL of solution?

Oxygen can be produced from the catalytic decomposition of KClO3 as shown in the balanced equation below. 2 KClO3 → 2 KCl + 3 O2 What is the percent yield if 3.20 grams of oxygen are formed from the reaction of 12.3 grams of KClO3?

The fundamental SI unit for measuring matter is the ________.

Which one of the following is not an empirical formula?

Ozone is unstable,decomposing to dioxygen,as shown in the balanced equation 2 O3 → 3 O2. In this reaction,how many grams of dioxygen can be formed from the decomposition of 96 grams of ozone?

The number of grams in 0.333 mol of urea, (NH2)2CO,is ________.

The balanced equation for the reaction of acetylene,C2H2,and oxygen in an acetylene torch is 2 C2H2 + 5 O2 → 4 CO2 + 2 H2O. In this reaction the number of grams of oxygen required to react with 0.13 g of acetylene is ________.

A balanced equation has the same numbers and kinds of ________ on both sides of the reaction arrow.

How many moles are in 7.8 g of acetamide,CH3CONH2?

Combustion analysis of 1.200 g of an unknown compound containing carbon,hydrogen,and oxygen produced 2.086 g of CO2 and 1.134 g of H2O.What is the empirical formula of the compound?

When the reaction C4H10 + O2 → CO2 + H2O is balanced using the smallest whole number coefficients,the coefficient in front of O2 is ________.

The balanced equation for the decomposition of water is shown below. 2 H2O → 2 H2 + O2 If 0.72 g of water react completely in this reaction,what is the theoretical yield of H2?

When carbon dioxide dissolves in water,H+ is formed,which makes the solution acidic,as shown in the balanced equation below. CO2 + H2O → HCO3- + H+ What is the percent yield if 0.0088 g of CO2 reacts with 900 g of H2O to form 0.000108 g of H+?

When the reaction C3H8 + O2 → CO2 + H2O is balanced,the total number of oxygen atoms in the balanced equation is ________.

Ozone reacts with iodide ion as shown in the balanced equation below. O3 + 2 I- + H2O → O2 + I2 + 2 OH- In this reaction,how many grams of dioxygen can be formed from the reaction of 96 grams of ozone?

If 4.0 g of H2 react with 4.0 g of F2 in the reaction shown below,what is the limiting reactant? H2 + F2 → 2 HF

Hydrazine,N2H4,is used as a rocket fuel.In the reaction below,if 80.1 g of N2H4 and 92.0 g of N2O4 are allowed to react,which is the limiting reactant,and how many grams of excess reactant remain at the end of the reaction? 2 N2H4 + N2O4 → 3 N2 + 4 H2O