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

August 18, 2021 | education

| **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.

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