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CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    The vapour pressure of pure water at \[26{}^\circ C\] is 25.21 torr. What is the vapour pressure of a solution which contains 20.0 g glucose, \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\] in 70 g water?

    A)  2.79 torr                             

    B)  15.7 torr

    C)  24.5 torr                             

    D)  32.0 torr

    Correct Answer: C

    Solution :

                    Moles of glucose \[=\frac{20.0\,g\,glu\cos e}{180\,g\text{/}mol}=0.111\,\,mol\] Moles of water \[=\frac{70.0\,g\,{{H}_{2}}O}{18.0g/mol}=3.89\,mol\,{{H}_{2}}O\] \[x({{H}_{2}}O)=\frac{3.89}{0.11+3.89}=0.972\]                 \[p=p{}^\circ {{x}_{{{H}_{2}}O}}=(25.21\,\,\text{torr})\,(0.972)=24.5\,\,\text{torr}\]


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