# Calculate the amount of substance, volume and number of molecules of 10 g of hydrogen.

Hydrogen is a gas whose molecule consists of two hydrogen atoms. Has a molecular formula H2. The molar mass is 2 g / mol.

Knowing the weight of the sample, you can easily find the amount of the substance by the formula:

n = m / M, where m is the mass of the sample, M is the molar mass of the substance

n = 10/2 = 5 mol hydrogen

Now we can calculate the volume and number of gas molecules. To calculate the volume, we will use the gas molar volume constant. One mole of gas according to Avogadro’s law under normal conditions occupies a volume of 22.4 liters. Means:

V = 22.4 * 5 = 112 liters

The number of molecules in 1 mole of a substance is also calculated according to Avogadro’s law. According to this law, 1 mole of a substance contains 6.02 * 10 ^ 23 molecules of a substance. This number is called Avogadro’s constant.

N = 5 * (6.02 * 10 ^ 23) = 30.1 * 10 ^ 23 molecules

Answer: 5 mol, 112 liters, 30.1 * 10 ^ 23 molecules