JEE Main 2024 Chemistry question
If three moles of an ideal gas at 300 K expand isothermally from 30 dm³ to 45 dm³ against a constant opposing pressure of 80 kPa, then the amount of heat transferred is J.
Answer: 1200
Solution
W = − ΔV = −80 × 10³ × (45 − 30) × 10⁻³ = −1200 J. For an isothermal process of an ideal gas ΔE = 0, so q = −W = +1200 J.