Jawabanmu

2014-08-01T06:34:36+07:00
A.) 2 molal berarti 2 mol urea dalam 1000 gram air
n urea = 2 mol
n air = massa/Mr = 1000/18 = 55,56
X urea = n urea/n urea + n air = 2/2+55,6 = 0,036

b.) massa urea = 2×60 = 120 gram
120/1000 × 100 persen = 12 persen