COMEDK · Chemistry · 6. Thermodynamics (C)
The change in the energy of system if \(500 \mathrm{cal}\) of heat energy are added to a system and system does \(350 \mathrm{cal}\) of work on the surroundings will be
- A \(-150 \mathrm{cal}\)
- B \(+150 \mathrm{cal}\)
- C \(+850 \mathrm{cal}\)
- D \(-850 \mathrm{cal}\)
Answer & Solution
Correct Answer
(B) \(+150 \mathrm{cal}\)
Step-by-step Solution
Detailed explanation
Heat absorbed, \[ q=500 \mathrm{cal} \] Work done by the system, \(W=-350 \mathrm{cal}\) According to the first law of thermodynamics, \(\Delta E=q+W=500+(-350)=+150 \mathrm{cal}\).
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