A solution is prepared by adding 60 g of urea to 180 g of water. The mole frraction of urea and water are ______ and ______ respectively.
A
0.091,0.909
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B
0.085,0.915
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C
0.909,0.091
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D
0.915,0.085
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Solution
The correct option is A 0.091,0.909 Molar mass ofNH2CONH2=14+2+12+16+14+2=60g/molMoles of urea(nurea)=6060=1molMolar mass of water =18g/molMoles of water (nwater)=18018=10molesMole fraction of urea=11+10=111=0.0909≈0.091Mole fraction of water=1−0.091=0.909