Benzene and toluene form nearly ideal solutions. At 2 0 ∘ C , the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The parial vapour pressure of benzene at 2 0 ∘ C for a solution containing 78 g of benzene and 46 g of toluene in torr is

Question

Benzene and toluene form nearly ideal solutions. At 2 0 ∘ C , the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The parial vapour pressure of benzene at 2 0 ∘ C for a solution containing 78 g of benzene and 46 g of toluene in torr is, 50, 25, 37.5, 53.5

MARKS App · Accepted Answer

Amount of benzene, $n_1=\frac{m_1}{M_1}=\frac{78 \mathrm{~g}}{78 \mathrm{gmol}^{-1}}=1 \mathrm{~mol}$ Amount of toluene, $n_2=\frac{m_2}{M_2}=\frac{46 \mathrm{~g}}{92 \mathrm{gmol}^{-1}}=0.5 \mathrm{~mol}$ Amount fraction of benzene, $x_1=\frac{n_1}{n_1+n_2}=\frac{1}{1.5}$ Partial pressure of benzene, $p_1=x_1 p_1^*=\frac{1}{1.5}(75$ Torr $)=50$ Torr

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