Question

Which is the heaviest among the following?

• A. $50$ g of $Fe$
• B. $5$ moles of $N_2$
• C. $0.1$ gram-atom of Ag
• D. $0.1$ g Ca

Answer 1

Answer: (B)

$5$ moles of $N_2$

Calculating individual weights:
50 gm of $Fe$ = $50$ g
5 moles of $N_2$ = $5\times Molecularweightof{N}_2=5\times 28=140$ g
0.1 gram atom of $Ag$ = $0.1\times 108=10.8$ g
0.1 gram atom of $Ca$ = $0.1\times 40=4.0$ g
$\therefore$ 5 mole of $N_2$ is the heaviest