Q5 / 150 · MHT CET 2021 (21 Sep Shift 1) · Chemistry

What is the volume (in $\mathrm{dm}^3$ ) occupied by $75 \mathrm{~g}$ ethane at S.T.P.?

  • A
    60.0
  • Correct answer
    B
    56.0
  • C
    22.4
  • D
    44.8

Solution

Number of moles of ethane $\left(\mathrm{C}_2 \mathrm{H}_6\right)=\frac{75}{30}=2.5$ Volume of gas at S.T.P $=$ moles $\times 22.4 \mathrm{~L}$ $$ \begin{aligned} & =2.5 \times 22.4 \\ & =56 \mathrm{~L} \\ & =56 \mathrm{dm}^3 \\ & \left(1 \mathrm{~L}=1 \mathrm{dm}^3\right) \end{aligned} $$

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

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