How many grams of methane gas (CH4) occupy a volume of 11.2 liters at STP

7.91 g

Step-by-step explanation:

1. Calculate the number of moles

STP is 0 °C and 1 bar.

One mole of a gas at STP has a volume of 22.71 L.

Moles of CH₄ = 11.2 L * (1 mol/22.71 L)

n = 0.4932 mol

2. Calculate the mass of CH₄

Mass of CH₄ = 0.4932 * 16.03

Mass of CH₄ = 7.91 g

11.2L/22.4L (STP value) x 1 mol of CH4 x 16.04 g of CH4 = 8.2 g