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Mass of element are-
carbon---12.02 gm/mol
Hydrogen--1.01 gm/mol
Oxygen----16 gm/mol
C2H5Oh has - 2 C + 6 H + 1 O
so mass will be = 2 x 12.02 + 6 x 1.01 + 1 x 16 = 24.04 + 6.06 + 16.00 = 46.1 gm/mol