Calculate The Molecular Mass Of The Following:
(A) $H_{2} {CO}_{3}$
(B) $C_{2} H_{5} OH$
(C) $H_{2} {SO}_{4}$

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Solution

Molecular mass:
The total atomic masses of all the atoms in a substance's molecule make up the molecular mass of that substance.
The atomic mass unit is used to express it (u).
$\begin{array}{rcl} Molecular mass of H_{2} {CO}_{3} & = & 2 (H) + 1 (C) + 3 (O) \\ = & 2 (1) + 1 (12) + 3 (16) \\ = & 2 + 12 + 48 \\ = & 62 u \\ Molecular mass of C_{2} H_{5} OH & = & 2 (C) + 6 (H) + 1 (O) \\ = & 2 (12) + 6 (1) + 1 (16) \\ = & 24 + 6 + 16 \\ = & 46 u \\ Molecular mass of H_{2} {SO}_{4} & = & 2 (H) + 1 (S) + 4 (O) \\ = & 2 (1) + 1 (32) + 4 (16) \\ = & 2 + 32 + 64 \\ = & 98 u \end{array}$

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100

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