M(CH4) = 16 g/mol
M(C) = 12 g/mol
M(4H) = 4 g/mol
W(C) = 12/16 = 75%
W(H) = 100 - 75 = 25%
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M(CH4) = 16 g/mol
M(C) = 12 g/mol
M(4H) = 4 g/mol
W(C) = 12/16 = 75%
W(H) = 100 - 75 = 25%