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What is the molality of a solution containing 200 mg of urea ( molar mass 60 g `mol^(-1)`) dissolved in 40 g of water ?A. `0.0825`B. `0.825`C. `0.498`D. `0.0013` |
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Answer» Correct Answer - A Molality (m) `= ("mass of solvent (in g)" xx 1000)/("molecular weight of solute" xx "mass of solvent (in g)")` `= (200 xx 10^(-3) xx 1000)/(60 xx 40) = 0.0833` |
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