Calculate how many, molecules, and moles contains 4 g of menthane gas (CH4), determine the volume

Calculate how many, molecules, and moles contains 4 g of menthane gas (CH4), determine the volume occupied by a given amount of substance.

In order to find the number of molecules, we must first find the amount of methane substance.
The mass of methane (given in the problem statement) is 4 g.
The molecular weight of methane (found from the periodic table) is 12 + 1 * 4 = 16.
The amount of methane substance (we divide the mass by the molar mass) is 4/16 = 0.25 mol.
The amount of substance is found by multiplying the amount of substance by Avogadro’s number: 0.25 * 6.0 ^ 23 * 10 ^ 23 = 1.5 * 10 ^ 23.
The volume of methane is found by multiplying the amount of substance by the molar volume: 22.4 * 0.25 = 5.6 liters.