Question

how it which formula is used​

Answer 1

1 molal solution is that which contains 1 mol of solute in 1 kg of solvent.

m(molality)= no. of moles of solute/ weight of solvent

Answer 2

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Answer...

Molality ,

$m \: = \frac{no. \: of \: moles \: of \: solute}{mass \: of \: solvent \: in \: kg} \\ \\ 1 \: = \frac{0.5}{w} \\ \\ w \: = \: 0.5 \: kg \\ \\ or \\ \\ w \: = \: 500 \: g$

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