At STP, what is the mass of 11.2 liters of O₂ gas? A)32.0 g B)128 g C)16.0 g D)64.0 g E)8.00 g

Question

Quizplus · Accepted Answer

At STP (standard temperature and pressure), the volume of 1 mole of gas is 22.4 liters. Therefore, to find the mass of 11.2 liters of gas, we need to determine how many moles of gas are in 11.2 liters and then calculate the mass from there.

1 mole of gas at STP has a mass of approximately 16.0 grams (this is the molar mass of oxygen gas, which is a major component of air).

So, if we have 11.2/22.4 = 0.5 moles of gas, then the mass would be 0.5 moles x 16.0 g/mole = 8.0 g. Therefore, the answer is C, 16.0 g.

At STP, What Is the Mass of 11