1.

In an aqueous solution of urea, mole fraction of urea is 0.4. Then w/w% of urea is:

Answer»

0.155
0.31
0.345
0.69

Solution :Mole FRACTION of urea =0.4
0.4 MOLES of urea +0.6 moles of `H_(2)O`
`%(w//w)=(0.4xx60)/((0.4xx60)+(0.6xx18))=(24)/(24+10.8)XX100`
`=(24)/(34.8)xx100=69%`


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