SATHEE: Chemical Thermodynamics Question 459

Chemical Thermodynamics Question 459

Question: The enthalpy change for the transition of liquid water to steam, $Δ H_{v a p} = 37.3, k J, m o l^{- 1}$ at $373, K$ . The entropy change for the process is

Options:

A) $111.9, J, m o l^{- 1} K^{- 1}$

B) $37.3, J, m o l^{- 1}, K^{- 1}$

C) $100, J, m o l^{- 1} K^{- 1}$

D) $74.6, J, m o l^{- 1} K^{- 1}$

Show Answer

Answer:

Correct Answer: C

Solution:

$Δ S_{v a p} = \frac{Δ H_{v a p}}{T} = \frac{37.3, K J, m o l^{- 1}}{373 K}$

$= 0.1, k J, m o l^{- 1}, K^{- 1}$

$= 100 J, m o l^{- 1}, K^{- 1}$ .

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Chemical Thermodynamics Question 459

Question: The enthalpy change for the transition of liquid water to steam, ΔHvap=37.3,kJ,mol−1 at 373,K . The entropy change for the process is

Options:

Answer:

Solution:

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Question: The enthalpy change for the transition of liquid water to steam, $Δ H_{v a p} = 37.3, k J, m o l^{- 1}$ at $373, K$ . The entropy change for the process is