Question

What will be the mass of 9.95 liters of propane gas (C3H8) at STP?

Answer 1

19.5g

Step-by-step explanation:

Given parameters:

Volume of propane gas = 9.95L

Unknown:

Mass of propane gas = ?

Solution:

To solve this problem, find the number of moles first.

At STP;

22.4L of gas makes up 1 mole

9.95L of gas will have a
`(9.95)/(22.4)` = 0.44mole

So;

Mass of propane gas = number of moles x molar mass

Molar mass of propane = 3(12) + 8(1) = 44g/mol

Mass = 0.44 x 44 = 19.5g