Question

30 g of urea is dissolved in 500g of water . calculate the molality of this solution .​

Answer 1

Answer :-

$\sf{Molarity = \frac{moles \: of \: solute}{mass \: of \: solvent \: in \: KG} } \\ { \sf{number \: of \: moles = \frac{30 \: gram}{60 \: gram \: per \: mole}}} \\ { \sf{ = 0.5 \: gram \: mole}} \\ \\ { \sf { \implies{ \frac{0.5 \: \times 1000 \: gram \: per \: kg}{500 \: gram} }}} \\ { \sf{ \implies{ One \: Mole \: per \: kg }}}$

Answer 2

Answer:

molality:wsolute×1000/molecular mass of solute ×wsolvent in grams

Explanation:

30×1000/60×500

=1mole per kg