Q60 / 180 · KCET 2013 · Chemistry

The mass of $112 \mathrm{~cm}^{3}$ of $\mathrm{NH}_{3}$ gas at $\mathrm{STP}$ is

  • Correct answer
    A
    $0.085 \mathrm{~g}$
  • B
    $0.850 \mathrm{~g}$
  • C
    $8.500 \mathrm{~g}$
  • D
    $80.500 \mathrm{~g}$

Solution

$1 \mathrm{~mol}$ of $\mathrm{NH}_{3}=17 \mathrm{~g}=22400 \mathrm{~cm}^{3}$ at STP i.e., $22400 \mathrm{~cm}^{3}$ of $\mathrm{NH}_{3}$ at STP have mass $=17 \mathrm{~g}$ $\therefore 112 \mathrm{~cm}^{3}$ of $\mathrm{NH}_{3}$ at STP will have mass $=\frac{17}{22400} \times 112=0.085 \mathrm{~g}$

Hence, the correct answer is option: 'A'.

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