How many molecules of methane gas,CH₄,have a mass equal to 3.20 g?

Name: How many molecules of methane gas,CH₄,have a mass equal to 3.20 g?
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Question

Quizplus · Accepted Answer

The molar mass of methane (CH₄) is 16.04 g/mol. Therefore, 3.20 g of methane is equal to 3.20 g / 16.04 g/mol = 0.2 mol of methane. 1 mol of methane contains 6.022 x 10^23 molecules. Therefore, 0.2 mol of methane contains 0.2 mol x 6.022 x 10^23 molecules/mol = 1.20 x 10^23 molecules.

How Many Molecules of Methane Gas,CH₄,have a Mass Equal to 3.20