Question

15 moles of an ideal gas at STP has a volume of ____liters

A. 336
B. 150
C. 15
D. 0.67
E. 0.15

Answer 1

A. 336 L

Explanation:

STP is 0 °C and 1 bar.

At STP, the molar volume of a gas is 22.71 L.

Volume = 15 mol × 22.71 L/mol

Volume = 341 L

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The above answer is not in your list of options.

It appears that you are using the OLD (pre-1982) definition of STP, at which the molar volume of a gas is 22.4 L.

Then

V = 15 mol × 22.4 L/mol = 336 L