Question

Use the following equation to answer the following questions:C3H8 +5O2 = 3CO2 + 4H2O (all are gases)1. If you start with 20 L of oxygen gas, how many Liters of water vapor can you make?2. If you start with 13.5L of oxygen gas, how many liters of carbon dioxide gas can you make?

Answer 1

Givens.

• 20 L of Oxygen.

,

• 5 volume O2 = 4 volume of H2O.

Remember that volume stoichiometry allows us to use the coefficients as volume.

$20L(O_2)\cdot\frac{4L(H_2O)}{5L(O_2)_{}}=16L(H_2O)$

(1) Therefore, 20 L of oxygen will produce 16 L of water vapor.

Keep using volume stoichiometry (coefficients) to form ratios and find the volumes.

• 5 volume O2 = 3 volume CO2.

$13.5L(O_2)\cdot\frac{3L(CO_2)}{5L(O_2)}=8.1L(CO_2)$

(2) Therefore, 13.5 L of oxygen will make 8.1 L of CO2.