Mastering Stoichiometry Concepts and Calculations

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

What does the law of conservation of mass state?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

In the reaction @@ ext{C}_2 ext{H}_4 + 3 ext{O}_2 ightarrow 2 ext{CO}_2 + 2 ext{H}_2 ext{O}@@, how many liters of oxygen are needed for 1 liter of ethylene?

Back

3 liters of oxygen are needed for 1 liter of ethylene.

Front

What is the molar volume of a gas at STP?

Back

The molar volume of a gas at standard temperature and pressure (STP) is 22.4 liters.

Front

How do you calculate the mass of a product formed in a reaction?

Back

To calculate the mass of a product, use the molar ratios from the balanced equation and the molar mass of the product.

Front

If 50 grams of reactants are used, what is the total mass of the products?

Back

The total mass of the products will also be 50 grams, according to the law of conservation of mass.

Front

In the reaction @@2 ext{KClO}_3 ightarrow 2 ext{KCl} + 3 ext{O}_2@@, how many moles of oxygen are produced from 2 moles of KClO3?

Back

3 moles of oxygen are produced from 2 moles of KClO3.

Front

What is the relationship between the volume of gases in a reaction at STP?

Back

The volumes of gases involved in a reaction at STP are in the same ratio as their coefficients in the balanced equation.

Front

How many liters of hydrogen gas are required to react with 22.4 liters of nitrogen gas to form ammonia?

Back

44.8 liters of hydrogen gas are required.

Front

What is the mass of carbon dioxide produced from burning 44 grams of propane?

Back

176 grams of carbon dioxide are produced.