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Enthalpy of sublimation of iodine is 24 {cal} {g}^{-1} at 200^

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Enthalpy of sublimation of iodine is $24 cal g^{- 1}$ at $20 0^{\circ} C$ . If specific heat of $I_{2} (s)$ and $I_{2}$ (vap.) are $0.055$ and $0.031$ cal $g^{- 1} K^{- 1}$ respectively, then enthalpy of sublimation of iodine at $25 0^{\circ} C$ in $cal g^{- 1}$ is (a) $2.85$ (b) $5.7$ (c) $22.8$ (d) $11.4$

Views: 5,738 students

Updated on: Feb 8, 2024

Book:

Arihant Chemistry JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

Text solutionVerified

When

q

is the amount of heat involved in a system then at constant pressure

q = q_{p}

and

C_{p} Δ T = Δ H

Given reaction

I_{2} (s) ⟶ I_{2} (g)

Specific heat of

I_{2} (s) = 0.055 cal g^{- 1} K^{- 1}

. Specific heat of

I_{2} (vap) = 0.031 cal^{- 1} K^{- 1}

. Enthalpy

(H_{1})

of sublimation of iodine

= 24 cal g^{- 1}

q

is the amount of heat involved in a system then at constant pressure

q = q_{ρ}

and

Δ H = C_{p} Δ T

H_{2} - H_{1} = C_{p} (T_{2} - T_{1})

H_{2} = H_{1} + Δ C_{p} (T_{2} - T_{1})

H_{2} = 24 + (0.031 - 0.055) (250 - 200)

H_{2} = 24 + (- 0.024) (50) = 24 - 12 = 22.8

cal / g

Thus, the enthalpy of sublimation of iodine at 250 is

22.8 cal / g

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Olivia Discussed

Enthalpy of sublimation of iodine is

24 cal g^{- 1}

20 0^{\circ} C

. If specific heat of

I_{2} (s)

and

I_{2}

(vap.) are

0.055

and

0.031

cal

g^{- 1} K^{- 1}

respectively, then enthalpy of sublimation of iodine at

25 0^{\circ} C

cal g^{- 1}

is (a)

2.85

(b)

5.7

(c)

22.8

(d)

11.4

15 mins ago

Discuss this question LIVE

15 mins ago

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Question Text	Enthalpy of sublimation of iodine is $24 cal g^{- 1}$ at $20 0^{\circ} C$ . If specific heat of $I_{2} (s)$ and $I_{2}$ (vap.) are $0.055$ and $0.031$ cal $g^{- 1} K^{- 1}$ respectively, then enthalpy of sublimation of iodine at $25 0^{\circ} C$ in $cal g^{- 1}$ is (a) $2.85$ (b) $5.7$ (c) $22.8$ (d) $11.4$
Updated On	Feb 8, 2024
Topic	Thermodynamics and Thermochemistry
Subject	Chemistry
Class	Class 11
Answer Type	Text solution:1 Video solution: 7
Upvotes	624
Avg. Video Duration	8 min

Text solutionVerified

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Enthalpy of sublimation of iodine is 24calg−1 at 200∘C. If specific heat of I2​(s) and I2​ (vap.) are 0.055 and 0.031 cal g−1 K−1 respectively, then enthalpy of sublimation of iodine at 250∘C in calg−1 is (a) 2.85 (b) 5.7 (c) 22.8 (d) 11.4

Text solutionVerified

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