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

H for the reaction, C(graphite) 2H (g) CH (g) → at 298 K and 1 atm is – 17900 cal.  The E for the above conversion would be

A.– 17900 cal
B.17900 cal
C.17308 cal✓ Correct
D.– 17304 cal
Explanation

Here, given: 17900cal g H U n RT 17900 U ( 1 2 298) U 17900 596 17304cal >> xx >> Thus, the correct option is (d)-17304 cal 131.  If 150 kJ of energy is needed for muscular work to walk a distance of one km, then how much of glucose one has to consume to walk a distance of 5 km, provided only 30% of energy is available for muscular work. (The enthalpy of combustion of glucose is 3000 kJ mol– 1 is) (a) 75 g (b) 30 g (c) 180 g (d) 150 g For walking 1km, the energy that is needed=150kJ For walking 5km, the energy that is needed= 150 5 750kJ x For Muscular work, only 30

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