0.448 liters of gas are equal to 0.88 g. Determine what kind of gas it is.

Let’s find the amount of substance of the unknown gas X:

v (X) = V / Vm = 0.448 / 22.4 = 0.02 (mol).

Let’s find the molecular weight of the unknown gas X:

M (X) = m (X) / v (X) = 0.88 / 0.02 = 44 (amu).

This molecular weight corresponds to:

propane, M (C3H8) = 12 * 3 + 1 * 8 = 36 + 8 = 44 (amu);
carbon dioxide, M (CO2) = 12 * 1 + 16 * 2 = 12 + 32 = 44 (amu).