SATHEE: Thermodynamics Question 98

Thermodynamics Question 98

Question: If at 298 K the bond energies of $C - H, C - C,$ $C = C$ and $H - H$ bonds are respectively 414, 347, 615 and 435 kJ $m o l^{- 1}$ , the value of enthalpy change for the reaction $H_{2} C = C H_{2} (g) + H_{2} (g) \to H_{3} C - C H_{3} (g)$ at 298 K will be [AIEEE 2003]

Options:

A) + 250 kJ

B) ? 250 kJ

C) + 125 kJ

D) ? 125 kJ

Show Answer

Answer:

Correct Answer: D

Solution:

$C H_{2} = C H_{2 (g)} + H_{2 (g)} \to H_{3} C - C H_{3 (g)}$

$414 \times 4 = 1656$

$414 \times 6 = 2484$

$615 \times 1 = 615$

$347 \times 1 = 347$

$435 \times 1 = \underset{\overset{―}{\underset{―}{2706}}}{435}$ 2831 $Δ H = 2706 - 2831 = - 125 k J$

Thermodynamics Question 98

Question: If at 298 K the bond energies of $C - H, C - C,$ $C = C$ and $H - H$ bonds are respectively 414, 347, 615 and 435 kJ $m o l^{- 1}$ , the value of enthalpy change for the reaction $H_{2} C = C H_{2} (g) + H_{2} (g) \to H_{3} C - C H_{3} (g)$ at 298 K will be [AIEEE 2003]

Options:

Answer:

Solution:

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Thermodynamics Question 98

Question: If at 298 K the bond energies of C−H,C−C, C=C and H−H bonds are respectively 414, 347, 615 and 435 kJ mol−1 , the value of enthalpy change for the reaction H2C=CH2(g)+H2(g)→H3C−CH3(g) at 298 K will be [AIEEE 2003]

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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Question: If at 298 K the bond energies of $C - H, C - C,$ $C = C$ and $H - H$ bonds are respectively 414, 347, 615 and 435 kJ $m o l^{- 1}$ , the value of enthalpy change for the reaction $H_{2} C = C H_{2} (g) + H_{2} (g) \to H_{3} C - C H_{3} (g)$ at 298 K will be [AIEEE 2003]