Molecular mass of a compound is defined as the mass of 1-mole molecules or Avogadro number of molecules of that compound. Molecular mass of methane ( 4 CH ) = 16 gram Moles of methane Mass of methane 1 mole 16 grams 0.1 mole X Solve for x, we get 16 0.1 1.6 1 x grams x Therefore, the mass of 0.1 moles of methane is 1.6 grams.
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