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mol Air = gr/Mr = 450/18 = 25 mol
mol larutan = 25+0,2 = 25,2 mol
Xt = mol C12H22O11/mol larutan
= 0,2/25,2 = 0,008
ΔP = Xt.P°
= 0,008 x 28,35
= 0,23 <--