MCQ
The weight of a molecule of the compound ${C_{60}}{H_{122}}$ is
  • $1.4 \times {10^{ - 21}}$ $g$
  • B
    $1.09 \times {10^{ - 21}}$ $g$
  • C
    $5.025 \times {10^{23}}$ $g$
  • D
    $16.023 \times {10^{23}}$ $g$

Answer

Correct option: A.
$1.4 \times {10^{ - 21}}$ $g$
a
(a) Molecular weight of ${C_{60}}{H_{122}}$$ = 12 \times 60 + 122 \times 1$ $ = 720 + 122 = 842$ $6 \times {10^{23}}$ molecule ${C_{60}}{H_{122}}$ has mass = $842\,gm$

$\therefore $ $1$ molecule ${C_{60}}{H_{122}}$ has mass $\frac{{842}}{{6 \times {{10}^{23}}}}$

$ = 140.333 \times {10^{ - 23}}gm$ $ = 1.4 \times {10^{ - 21}}\,gm$.

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