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The vapour pressure of pure water at 37^...

The vapour pressure of pure water at `37^@C` is 47.1 torr. What is the vapour pressure of an aqueous solution at `37^@C` containing 20 g of glucose dissolved in 500 gm of water. Also calculate vapour pressure lowering

Text Solution

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`""^nH_2O = (500)/(18)=27.78 mol n_("ghucose")=(20)/(180)=0.11mol`
`X_(H_2O) =(n_(H_2O))/(n_(H_2O)+n_("ghucose"))=(27.78)/(27.89)=0.996`
According to Raoult’s law,
Vapour pressure of solution `P_(H_2O)=P_(H_2O)^@X_(H_2O)=47.1 xx 0.996 =46.9` torr
Lowring of vapour pressure `P_(H_2O)^@ -P_(H_2O)= 47 .1-46.9 =0.2` torr
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