Which of the following compound has the highest mass?

5 moles of

H_{2} O

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12 moles of

{CO}_{2}

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10 moles of

{SO}_{2}

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13 moles of

{NO}_{2}

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Solution

The correct option is C 10 moles of ${SO}_{2}$
Gram molecular mass of a substance is the mass of one mole of that substance. It is the sum of the atomic masses of the constituent atoms.
$\begin{matrix} M o l e c u l e & N o . o f m o l e s & G r a m m o l e c u l a r m a s s o f a m o l e c u l e (g) & T o t a l m a s s (g) H_{2} O & 5 & 2 (1) + 16 = 18 & 90 C O_{2} & 12 & 12 + 2 (16) = 44 & 528 S O_{2} & 10 & 32 + 2 (16) = 64 & 640 N O_{2} & 13 & 14 + 2 (16) = 46 & 598 \end{matrix}$
Therefore, 10 moles of sulphur dioxide ${SO}_{2}$ have the greatest mass.

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