1.

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 is :

Answer»

`5.55xx10^(-4)m`
`33.3` m
`3.33xx10^(-2)`m
0.555 m

Solution :Density of water at `25^(@)C=1`g/ML
VOLUME of water `=0.3xx1000=300` mL
Mass of water `=300xx1=300g`
Moles of urea `=(0.01)/(60)`
MOLALITY `=(0.01xx1000)/(60xx300)=5.55xx10^(-4)`m


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