Which of the following would weigh the highest?
(a) 0.2 mole of sucrose $(C_{12} H_{22} O_{11})$
(b) 2 moles of $C O_{2}$
(c) 2 moles of $C a C O_{3}$
(d) 10 moles of $H_{2} O$

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Solution

Weight of a sample in gram = number of moles $\times$ molar mass
(a) 0.2 moles of $C_{12} H_{22} O_{11} = 0.2 \times 342 = 68.4 g$
(b) 2 moles of $C O_{2} = 2 \times 44 = 88 g$
(c) 2 moles of $C a C O_{3} = 2 \times 100 = 200 g$
(d) 10 moles of $H_{2} O = 10 \times 18 = 180 g$
$∴$ 2 moles of $C a C O_{3}$ weighs the highest.

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