A fixed mass of an ideal gas absorbs 1000J of heat and expands under a constant pressure of 20 kPa from a volume of 25x10(-3) m3 to a volume of 25x10(-3)m3. What is the change in internal energy of the gas?
A) -1000J
B) -900J
C) Zero
D) +500J
E) +1000J?
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