Reaction Stoichiometry Chemistry

Stoichiometry

100

What does a coefficient mean in stoichiometry?

The amount of moles in a balanced equation.

200

What is stoichiometry about?

The study of quantitative relationships between reactants and products in a chemical reaction.  Chemistry math.

300

How many steps in a mass to mass stoichiometry conversion?

3 steps.

400

What are the two parts that you look for in a stoichiometry problem?

The given and the unknown.

500

If I need to go to liters, what is the constant for liters/mol?

22.4 L

Composition Stoichiometry

100

What is the mole ratio of carbon  to hydrogen in C₂H_6?

What is 2:6.

200

Reactant that is not used up when a reaction is run to completion

excess reactant

300

You are asked to find the mass of a compound.  Where should you look?

Periodic table

400

What is the first step you should do in stoichiometry?

Balance the equation

500

If you have 5 L of H₂O, how many moles do you have?

0.223 mol of H₂O

Mighty Moles

100

What is necessary to convert moles of one element to moles of another element?

mole ratio

200

What is the constant for the amount of a mole in molecules, atoms, and particles is?

Avogadro's number.

300

What are the units for molar mass?

grams/mole

400

What is the number of moles of carbon in the compound C₆H₁₂O₆?

6 moles

500

Given the compound 4NH₃, how many moles of hydrogen would this compound contain?

12 moles.

Magical Mole to Mole

100

What is the mole ratio of Fe and O in the compound Fe₃O₄?

3 mols Fe: 4 mols O.

200

What is the mole ratio of hydrogen gas to water in the following equation?

H₂ + O_{2 -->} 2H₂O

1 mol : 2 mol

300

What is the molar mass for CaOH?

57 grams

400

What would be the molar mass for the compound NaOH?

40 grams

500

If you are given 4.0x10⁴mols of NaOH, how many moles of (OH) hydroxide are present?

What is 4.0x10⁴mols of OH.

Problems

100

If you have 4 moles of Fe, how many atoms of Fe do you have?

2.409 x 10²⁴ atoms

200

How many moles are present in 5.67 x 10²⁵ of atoms of carbon?

94.2 moles

300

How many moles of Al₂O₃ is produced if you have 2 moles of Al?

4 Al + 3 O₂ --> 2 Al₂O₃

1 mol of Al₂O₃

400

 C₃H₈ + 5 O₂ -->3 CO₂ + 4 H₂O

If 4.5 moles of C₃H₈ combusts, how many moles of CO₂ will be produced?

13.5 mols of CO₂

500

Fe₂O₃ + C → Fe + CO₂ 

If you start with 2.5 grams of carbon, how many grams of iron will be produced?

*HINT - make sure your equation is balanced. 

15.523 g of Fe