90 g non-volatile, non-dissociative solute is added to 1746 g water to form a dilute, ideal solution. The vapour pressure of water has decreased from 300 m m of H g to 291 m m of H g . The molecular weight of solute is.

Question

90 g non-volatile, non-dissociative solute is added to 1746 g water to form a dilute, ideal solution. The vapour pressure of water has decreased from 300 m m of H g to 291 m m of H g . The molecular weight of solute is., 90, 60, 30, 15

MARKS App · Accepted Answer

P - P s P = X s o l u t e × i i = 1 ∴ s o l v e i s n o n- i o i n s a b l e 300 - 291 300 = 90 / M 90 M + 1746 18 9 300 = 90 M 90 M + 97 3 × 90 M × 100 + 97 × 3 100 = 90 M 18 10 M + 97 × 3 100 = 90 M 90 M - 18 10 M - 97 × 3 100 900 - 18 10 M = 97 × 3 10 M = 882 × 10 97 × 3 = 30.3 ≅ 30

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