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Question

If ΔQ and ΔW represents the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as

A
ΔQ=ΔU+ΔW
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B
ΔQ=ΔUΔW
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C
ΔQ=ΔWΔU
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D
ΔQ=ΔWΔU
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Solution

The correct option is B ΔQ=ΔUΔW
from FLOT ΔQ=ΔU+ΔW
Heat supplied to the system so ΔQPositive and work is
done on the system so ΔWNegative
Hence +ΔQ=ΔUΔW

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