A sample of C3H8 has 6.72 x 10^24 H atoms.

What is the total mass of the sample?

The answer is 492.8 g

1. Calculate a number of moles of a sample.

2. Calculate a molar mass of C3H8.

3. Calculate a mass of the sample.

1. Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance: 6.023 * 10²³ units per 1 mole

6.023 * 10²³ atoms : 1 mol = 6.72 * 10²⁴ atoms : n

n = 6.72 * 10²⁴ atoms * 1 mol : 6.023 * 10²³ atoms = 1.12 * 10 mol = 11.2 mol

2. Molar mass (Mr) of C3H8 is sum of atomic masses (Ar) of its elements:

Ar (C) = 12 g/mol

Ar (H) = 1 g/mol

Mr (C3H8) = 3 * Ar (C) + 8 * Ar (H) = 3 * 12 + 8 * 1 = 36 + 8 = 44 g/mol

3. Mass (m) of a sample is number of moles (n) multiplied by molar mass (Mr) of C3H8:

m = n * Mr = 11.2 mol * 44 g/mol = 492.8 g