When 20 g of naphthoic acid (C 11 H 8 O 2 ) is dissolved in 50 g of benzene k f = 1 .72 Kkg mol − 1 , a freezing point depression of 2 K is observed. The van't Hoff factor (i) is

Question

When 20 g of naphthoic acid (C 11 H 8 O 2 ) is dissolved in 50 g of benzene k f = 1 .72 Kkg mol − 1 , a freezing point depression of 2 K is observed. The van't Hoff factor (i) is, 0.5, 1, 2, 3

MARKS App · Accepted Answer

Actual molecular weight of naphthoic acid (C 11 H 8 O 2 ) = 172 Molecular mass (calculated) = 1000 × k f × w W × ΔT f = 1000 × 1 .72 × 20 50 × 2 = 344 van't Hoff factor (i) = actual mol .wt . calculated mol .wt . = 172 344 = 0.5

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