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Q.

Heat of 30 kcal is supplied to a system and 4200J of external work is done on the system so that its volume decreases at constant pressure. What is the change in its internal energy. $(J = 4200 J / kcal)$

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a

$4.302 \times 10^{5} J$

b

$2.302 \times 10^{5} J$

c

$1.302 \times 10^{5} J$

d

$3.302 \times 10^{5} J$

answer is A.

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Detailed Solution

detailed_solution_thumbnail

$Δ Q = 30 \times 4200 = 126000 J$

$Δ W = - 4200 J$

$Δ U = Δ Q - Δ W = 126000 + 4200$

$= 1.302 \times 10^{5} J$

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Heat of 30 kcal is supplied to a system and 4200J of external work is done on the system so that its volume decreases at constant pressure. What is the change in its internal energy. (J=4200J/kcal)