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Answer :
We know that molecular mass of a substance is the sum of the atomic masses of all the atoms in the molecule of the substance.
The molecular mass of H\( _2 \) = atomic mass of H + atomic mass of H = 2 × atoms atomic mass of H = 2 × 1 = 2u
The molecular mass of O\( _2 \) = 2 × atoms atomic mass of O = 2 × 16 = 32u
The molecular mass of Cl\( _2 \) = 2 × atoms atomic mass of Cl = 2 × 35.5 = 71u
The molecular mass of CO\( _2 \) = atomic mass of C + 2 × atomic mass of O = 12 + ( 2 × 16) = 44u
The molecular mass of CH\( _4 \) = atomic mass of C + 4 × atomic mass of H = 12 + ( 4 × 1) = 16u
The molecular mass of C\( _2 \)H\( _6 \) = 2 × atomic mass of C + 6 × atomic mass of H = (2 × 12) + (6 × 1) = 24 + 6 = 30u
The molecular mass of C\( _2 \)H\( _4 \) = 2 × atomic mass of C + 4 × atomic mass of H = (2 × 12) + (4 × 1) = 24 + 4 = 28u
The molecular mass of NH\( _3 \) = atomic mass of N + 3 × atomic mass of H = 14 + (3 × 1) = 17u
The molecular mass of CH\( _3 \)OH = atomic mass of C + 3 × atomic mass of H + atomic mass of O + atomic mass of H = 12 + (3 × 1) + 16 + 1 = 12 + 3 + 17 = 32u