Stoichiometry

Conversion Factors

100

The conversion factor used to change from moles of a substance to the number of atoms or molecules of a substance

What is Avogadro's number?

200

This is what you use to convert from grams of a substance to moles of a substance

What is molar mass

300

The conversion factor used to find the volume of a gas at STP from moles.

What is 22.4L per mole?

400

This allows you to convert from units of one substance to units of another substance using the balanced equation.

What is mole to mole ratio?

500

There are this many grams in 7 moles of a hydrogen molecule

What is 14.14 grams?

Vocabulary

100

The ratio of actual yield to theoretical yield expressed as a percent.

What is percent yield?

200

The reactant that determines the amount of product that can be formed by a reaction

What is the limiting reagent?

300

The maximum amount of product that can be formed with given amounts of reactants.

What is the theoretical yield?

400

The amount of product that actually forms when the reaction is carried out experimentally.

What is actual yield?

500

The calculation of quantities in chemical reactions.

What is stoichiometry?

Calculate

100

Balance the following equation

C₂H₄ + O₂ -> CO₂ + H₂O

C₂H₄ + 3O₂ -> 2CO₂ + 2H₂O

200

How many moles of NH₃ are produced when 0.60 mol of nitrogen reacts with hydrogen

1.2 mol NH₃

300

How many molecules of oxygen are produced when 29.2 g of water is decomposed by electrolysis according to this balanced equation

2H₂O -> 2H₂ + O₂

4.88 x 10²³ molecules O₂

400

Copper reacts with sulfur to form copper(I) sulfide.  What is the limiting reagent when 80.0g Cu reacts with 25.0g S?

2Cu + S -> Cu₂S

Copper

500

What is the percent yield if 13.1g CaO is actually produced when 24.8g CaCO₃ is heated?

CaCO₃ -> CaO + CO₂

94.2%

Describe

100

Describe how you find limiting reactant

Convert given quantity of reactants into moles of same unit.  The smaller amount will be the limiting reactant.

200

Given grams of a two reactants, describe how to find how many grams of a product has formed.

Find limiting reactant -> convert grams to moles of limiting reactant -> convert to moles of desired product using mole to mole ratio -> convert to grams of desired product using molar mass

300

Given grams of a reactant and actual yield of a product, describe how to calculate percent yield

Convert grams of reactant to moles -> moles reactant to moles product using mole ratio -> mole product to grams product using molar mass (theoretical yield) -> divide ACTUAL yield over found theoretical yield

400

Given Liters of a reactant, describe how to calculate molecules of a product

Liters of reactant to moles using molar volume -> moles reactant to moles product using mole ratio -> moles to molecules using Avogadro's number

500

Given grams of a reactant, describe how to calculate Liters of a product.

Grams to moles using molar mass -> mole reactant to moles product using mole ratio -> moles to liters using molar volume (22.4L/mol)