A sample was recorded to have 15.0 grams of hydrogen gas, how many liters would this be?

168 L

Explanation:

Given data:

Mass of hydrogen gas = 15 g

Volume occupied = ?

Solution:

First of all we will calculate the number of moles of hydrogen gas.

Number of moles = mass/ molar mass

Number of moles = 15 g/ 2 g/mol

Number of moles = 7.5 mol

One mole of any gas at STP occupy 22.4 L volume.

The standard temperature and pressure is 0°C and 1 atm.

Thus the volume occupy by the 7.5 moles hydrogen gas is,

7.5 mol × 22.4 L/1 mol = 168 L