Verified Solution • 2025–26 Session moderate

QJEEM13Ch8c24: JEE Main 2013 Chemistry - Class 11 JEEM13Ch8c24 Solution: A piston filled with 0.04 mol of an ideal gas expands…

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0oC. As it does so, it absorbs 208J of heat. The values of q and w for the process will be :
(R = 8.314 J/mol K) ( l n 7.5 = 2.01)

Multiple Choice Options

  • A q = – 208 J, w = – 208 J
  • B q = – 208 J, w = + 208 J
  • C q = + 208 J, w = + 208 J
  • D q = + 208 J, w = – 208 J

Step-by-Step Verified Solution

By Ist law of thermodynamics, q = ΔE – W

At const T, ∆E = 0

q = – W

Heat absorbed = 208 J

∴ q = +208 J

W = – 208 J

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