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When 20 {~g} of naphthoic acid (C_{11} {H}_{8} {O}_{2}) is dis

Question

Medium

Solving time: 3 mins

When $20 g$ of naphthoic acid $(C_{11} H_{8} O_{2})$ is dissolved in $50 g$ of benzene $(k_{f} = 1.72 kg mol^{- 1})$ , a freezing point depression of $2 K$ is observed. The van't Hoff factor ( $i$ ) is:

0.5

1

2

3

Views: 5,839 students

Updated on: Sep 15, 2022

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Charlotte Discussed

When

20 g

of naphthoic acid

(C_{11} H_{8} O_{2})

is dissolved in

50 g

of benzene

(k_{f} = 1.72 kg mol^{- 1})

, a freezing point depression of

2 K

is observed. The van't Hoff factor (

i

) is:

11 mins ago

Discuss this question LIVE

11 mins ago

Text solutionVerified

Actual molecular weight of naphthoic acid

(C_{11} H_{8} O_{2}) = 172 u

Molecular mass (calculated)

= \frac{1000 \times k _{f} \times w}{W \times Δ T _{f}} = \frac{1000 \times 1.72 \times 20}{50 \times 2} = 344 u

van^{'} t

Hoff factor

(i) = \frac{actual mol.wt.}{calculated mo.wt.} = \frac{172}{344}

= 0.5.

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Question Text	When $20 g$ of naphthoic acid $(C_{11} H_{8} O_{2})$ is dissolved in $50 g$ of benzene $(k_{f} = 1.72 kg mol^{- 1})$ , a freezing point depression of $2 K$ is observed. The van't Hoff factor ( $i$ ) is:
Updated On	Sep 15, 2022
Topic	Solutions
Subject	Chemistry
Class	Class 12
Answer Type	Text solution:1 Video solution: 5
Upvotes	598
Avg. Video Duration	5 min

When $20 g$ of naphthoic acid $(C_{11} H_{8} O_{2})$ is dissolved in $50 g$ of benzene $(k_{f} = 1.72 kg mol^{- 1})$ , a freezing point depression of $2 K$ is observed. The van't Hoff factor ( $i$ ) is:

Text solutionVerified

Filo tutor solutions (5)

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When 20 g of naphthoic acid (C11​H8​O2​) is dissolved in 50 g of benzene (kf​=1.72 kg mol−1), a freezing point depression of 2 K is observed. The van't Hoff factor ( i ) is:

Text solutionVerified

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When $20 g$ of naphthoic acid $(C_{11} H_{8} O_{2})$ is dissolved in $50 g$ of benzene $(k_{f} = 1.72 kg mol^{- 1})$ , a freezing point depression of $2 K$ is observed. The van't Hoff factor ( $i$ ) is: