JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
If three moles of an ideal gas at \(300 \mathrm{~K}\) expand isotherrnally from \(30 \ \mathrm{dm}^3\) to \(45 \ \mathrm{dm}^3\) against a constant opposing pressure of \(80 \ \mathrm{kPa}\), then the amount of heat transferred is___________ \(\mathrm{J}\).
- A \(1100\)
- B \(3200\)
- C \(4700\)
- D \(1200\)
Answer & Solution
Correct Answer
(D) \(1200\)
Step-by-step Solution
Detailed explanation
Using, first law of thermodynamics, \( \Delta \mathrm{U}=\mathrm{Q}+\mathrm{W}, \) \( \Delta \mathrm{U}=0: \text { Process is isothermal } \) \( \mathrm{Q}=-\mathrm{W} \) \( \mathrm{W}=-\mathrm{P}_{\text {ext }} \Delta \mathrm{V}: \text { Irreversible } \)…
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