Chemistry
Mass to mole calculations EXTRA
Minniear
The KEY follows… (This is a new – please tell me if you spot a type-O or something. Thanks!)
grams x ↔ mole x
The molar ratio from the balanced
equation is like a bridge from one
↔
compound to the other. You must be in
moles – never grams - to cross it.
Molar mass
↔ mole y
↔
grams y
Molar mass
Use the following equation for the combustion of propane to answer the questions. Propane is a
by-product of natural gas processing and petroleum refining, and is used for barbeque grills,
portable stoves, and home heating.
C3H8 + 5 O2 → 3 CO2 + 4 H2O
1. Given 25.0 g of propane (C3H8), how many moles of oxygen are required for a complete
reaction?
2. In order to produce 100.00 g of water, how many moles of oxygen are required?
3. A reaction producing 11 moles of carbon dioxide will produce how many moles of water as well?
4. With a limit of 50.0 moles of oxygen, how many grams of carbon dioxide will be produced?
Chemistry
Mass to mole calculations EXTRA
Minniear
KEY
C3H8 + 5 O2 →3 CO2 + 4 H2O
1. Given 25.0 g of propane (C3H8), how many moles of oxygen are required for a complete
reaction?
Molar mass to go from
grams to moles
Molar ratio from
equation
2. In order to produce 100.00 g of water, how many moles of oxygen are required?
Molar mass to go from
grams to moles
Molar ratio from
equation
3. A reaction producing 11 moles of carbon dioxide will produce how many moles of water as
well?
There is no conversion to or from grams; only the molar ratio is required.
4. With a limit of 50.0 moles of oxygen, how many grams of carbon dioxide will be produced?
Molar ratio from
equation
Molar mass to go from
moles to grams