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Calculate the mass of urea `(NH_(2)CONH_(2))` required in making `2.5 kg `of `0.25 `molal aqueous solution.

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Calculate the mass of urea `(NH_(2)CONH_(2))` required in making `2.5 kg `of `0.25 `molal aqueous solution.
A. `37.5g`
B. `73.5g`
C. `53.7g`
D. `75.3g`
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Correct Answer - A
`"Molality"=(("mass")/("molar mass"))/("molar ofsolvent (in kg)")`
`0.25=(("mass")/(60))/(2.5)" "(because" Molar mass of urea = 60")`
`"or Mass"=0.25xx2.5xx60=37.5g`
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