Stoichiometry Review

Review of Stoichiometry

​Stoichiometry – Using the mole ratio from the balanced equation and information about one compound in the reaction to determine information about another compound in the equation.

​What do the coefficients really mean?

​C₃H₈ + 7O₂ → 6CO + 8H₂O

C₃H₈ + 7O₂ → 6CO + 8H₂O
How many moles of Oxygen will react with 25.8 moles of Propane (C₃H₈) completely?

​

​C₃H₈ + 7O₂ → 6CO + 8H₂O

Mole to Mole Ratio

​

​C₃H₈ + 7O₂ → 6CO + 8H₂O

Limiting Reactant
vs.
Excess Reactants

​

Multiple Select

1 mole (mol) is equal to ...

• 6.02 x 10²³ atoms

• Molar Mass of compound or element

• 22.4 Liters (L)

• 6.02 x 10²³ molecules

• 6.02 x 10²³ particles

Multiple Choice

When using a chemical equation to change one molecule into a different molecule, you use this.

• Mole to Mole Conversion

• T-Chart

• Cross Multiplication

Multiple Choice

Mole to Mole Conversion Practice

• 2

• 3

• 4

• 6

Multiple Choice

How many moles of oxygen are necessary to react completely with four moles of propane?

• 5

• 4

• 12

• 15

• 20

Multiple Choice

How many grams are in 5.6 moles of sodium bromide (NaBr)?

Na = 23 g/mol

Br = 80 g/mol

• 36.8 g/mol
• 18.4 g
• 576 g

• 756 g

Multiple Choice

How many moles of sulfur are in 1.8 * 10²⁴ sulfur atoms?

• 3.0 mole sulfur atoms
• 1.0 mole of sulfur atoms
• 1.1 * 10⁴⁸ mole sulfur atoms
• 2.0 mole sulfur atoms

Multiple Choice

How many atoms are in 3.5 moles of copper?

• 3500 Cu atoms
• 6.02 *10²³ Cu atoms
• 2.1 * 10²⁴ Cu atoms
• 2.2 *10²³ Cu atoms

Multiple Choice

How many moles are in 550 g of carbon dioxide?

C = 12 g/mol

O = 16 g/mol

• 19.6 mol
• 15.3 mol
• 12.5 mol
• 4.5 mol

Multiple Choice

Molar mass= ____ mol

• 1

• 2

Multiple Choice

is the volume of 1 mole of a gas at STP and is 22.4L/mol for any ideal gas

• Molar volume

• Molar Area

Multiple Choice

1 mole = 6.02 x 1023 representative particles

This is also known as ______

• Avogadro’s number.

• Beethoven's number.

Multiple Choice

S₈ + 12 O₂ → 8 SO₃

How many moles of S₈ is needed to produce 12 moles of SO₃?

• 1

• 1.5

• 2

• 12

Multiple Choice

When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

Multiple Choice

What is a Excess Reactant?

• amount you end with
• what you run out of first
• what you have left over
• what you start with

Multiple Choice

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

Multiple Choice

How many step will it take for me to go from grams to moles unknown

• 1

• 2

• 3

• 4

Multiple Choice

I use molar mass when the problem gives me grams?

• False

• True

Multiple Choice

I use mole ratio (coefficients) from balanced chemical equation?

• True

• False

Multiple Choice

How many steps will it take me to go from grams to grams?

• 4

• 3

• 2

• 1

Multiple Choice

How many step will it take for me to go from moles given to moles unknown?

• 1

• 2

• 3

• 4

Multiple Choice

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Ethane (C₂H₆) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?

Multiple Choice

In the equation: C₂H₄ + 3O₂ --> 2CO₂ + 2H₂O

How many Liters of CO₂ will be produced from 20g of C₂H₄ ?

• 31.4L

• 28L

• 36L

• 32L

Multiple Choice

What volume will 0.75 moles of Nitrogen gas occupy at STP?

• 15L

• 16L

• 16.8L

• 15.8L