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The molality of a urea solution in which ` 0.0100 g ` of urea, ` [(NH_(2))_(2)CO] ` is added to ` 0.3000 dm^(3) `of water at STP isA. ` 0. 555 m`B. ` 5.55 xx 10^(-4) m`C. ` 33.3 m`D. ` 3.33 xx 10^(-2) m` |
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Answer» Correct Answer - B Molality `=("moles of solute")/("kg of water")` Moles of unrea` =(0.010)/(60) mol` Water at `STP (d=1 g/cm^(3) =1 kg//dm^(3)) =0.3 dm^(3) =0.3 kg` ` :.` Molality `=(0010)/(60xx0.3) =5.555 xx10^(-4) m`. |
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