Question

Question 5
Which of the following would weigh the highest?
(a) 0.2 mole of sucrose $\left(C_{12}{H}_{22}{O}_{11}\right)$
(b) 2 moles of $C{O}_2$
(c) 2 moles of $CaC{O}_3$
(d) 10 moles of $H_{2}O$

Answer 1

Weight of a sample in gram = number of moles $\times$ molar mass
(a) 0.2 moles of $C_{12}{H}_{22}{O}_{11}=0.2\times 342=68.4g$
(b) 2 moles of $C{O}_2=2\times 44=88g$
(c) 2 moles of $CaC{O}_3=2\times 100=200g$
(d) 10 moles of $H_{2}O=10\times 18=180g$
$\therefore$ 2 moles of $CaC{O}_3$ weighs the highest.