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NEET-XII-Chemistry

02: Solutions

with Solutions - page 3
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  • #13
    The partial pressure of ethane over a solution containing 6.56 × 10-3 g of ethane is 1 bar. If the solution contains 5.00 × 10-2 g of ethane, then what shall be the partial pressure of the gas?
    Ans : Molar mass of ethane (C2H6) = 2 × 12 + 6 × 1
    = 30 g mol-1
    Number of moles present in 6.56 × 10-3 g of ethane
    = 2.187 × 10-4 mol
    Let the number of moles of the solvent be x.
    According to Henry’s law,
    p = KHx

    Number of moles present in 5.00 × 10-2 g of ethane
    = 1.67 × 10-3 mol
    According to Henry’s law,
    p = KHx

    = 7.636 bar
    Hence, partial pressure of the gas shall be 7.636 bar.