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mol air = 90/18 = 5
fraksi mol zat terlarut Xt = mol glukosa / [mol glukosa + mol air]
Xt = ( x/180) / [( x/180) + 5]
tekanan uap jenuh air p₀ = 30 mmHg
penurunan tekanan uap larutan Δp = 30 - 29,41 = 0,59 mmHg
Δp = p₀.Xt
0,59 = (30 ) . ( x/180) / [( x/180) + 5]
0,59 . [( x/180) + 5] = 30x/180
0,59x/180 + 2,95 = 30x/180
29,41x/180 = 2,95
x = (180 . 2,95) / 29,41
diperoleh nilai x = 18,06 gram
___selesai___
semoga membantu. bila berkenan silahkan ditandai sebagai jawaban terbaik untuk penambah semangat