First slide

First law of thermodynamics

Question

A system absorbs 1000 cal of heat and does 1675 J of external work. If J = 4.18 J/cal, then the change in internal energy of the system is

Moderate

A

+1675 J
B

+2505 J
C

+1000 J
D

+650J

Solution

$\begin{array}{l} ΔU = Q - W \\ = (1000 \times 4 .18 - 1675) J = 2505 J \end{array}$

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