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NCERT Class XII Chemistry
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Question : 13 of 53
Marks: +1, -0
The partial pressure of ethane over a saturated solution containing 6.56×10−3^{-3} g of ethane is 1 bar. If the solution contains 5.00 × 10−2^{-2} g of ethane, then what shall be the partial pressure of the gas?
Solution:  
Applying the relationship, m=KH×pm=K_{H} \times p
In thefirst case, 6.56×10−3 g=KH×16.56 \times 10^{-3} \,\mathrm{g}=K_{H} \times 1 bar or KH=6.56×10−3 g bar−1K_{H}=6.56 \times 10^{-3} \,\mathrm{g} \,\mathrm{bar}^{-1}
In the second case, 5.00×10−2 g5.00 \times 10^{-2} \,\mathrm{g} =(6.56×10−3 g bar−1)×p= (6.56 \times 10^{-3} \,\mathrm{g} \,\mathrm{bar}^{-1}) \times p or, p=5.00×10−2 g6.56×10−3 g bar−1=7.62 barp=\frac{5.00 \times 10^{-2} \,\mathrm{g}}{6.56 \times 10^{-3} \,\mathrm{g} \,\mathrm{bar}^{-1}}=7.62 \,\mathrm{bar}
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