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What is the atomic weight of one mole of CH4?

How many moles in 64 grams of CH4?

Molecular weight CH4 = 12 + 4X1 = 16 amu = 16 g/mol

64 g / 16 g/mol = 4 moles CH4

One mole of CH4 has a mass of 16.0 g (C = 12; 4H = 4)

64 g CH4 x (1 mol / 16 g) = 4.00 mol