When 20 g of naphthoic acid ( C 11 H 8 O 2 ) is dissolved in 50 g of benzene ( K f = 1.72 K kg 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 K kg mol − 1 ) , a freezing point depression of 2 K is observed. The van't Hoff factor ( i ) is:

TestHub · Accepted Answer

Δ T f ​ = i K f ​ m , 2 = i × 1.72 × 172 20 ​ × 50 1000 ​ i = 1.72 × 20 × 1000 2 × 172 × 50 ​ = 0.5

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