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Calculate the mass of urea (NH(2)CONH(2)...

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`

Text Solution

Verified by Experts

The correct Answer is:
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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