MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryThermodynamics and ThermochemistryRelationship Between ΔH and ΔU

105. (∆U – ∆H) for the formation of NH₃ from N₂ and H₂ is :

A.–2 RT
B.2 RT
C.RT✓ Correct
D.1
Explanation

2 2 3 N 3H 2NH n 2 4 2 H U nRT U H nRT 2 R T 106. The difference between  heats of reaction at constant pressure and constant volume for the reaction. 2 6 2 2 2 2C H l 15O g 12CO g 6H O l → at 25°C is (a) –7.43 kJ (b) +3.72 kJ (c) –3.72 kJ (d) 7.43 kJ Heat of reaction at constant pressure = H Heat of reaction at constant volume = U 3 H U nRT;  n 12 15 3 H U nRT 3 8.3 298 7.43 10 J x x x 107. Consider the reaction at 300 K 2 2 H g Cl g 2HCl g ; H 185kJ → If 2 mole of H₂ completely rea

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