Verified Solution • 2025–26 Session moderate

QJEEM19Phdef8: JEE Main 2019 Physics - Class 11 JEEM19Phdef8 Solution: A cylinder with fixed capacity of 67.2 lit contains helium gas…

A cylinder with fixed capacity of 67.2 lit contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 20°C is : [Given that R = 8.31 J mol–1 K–1]

Multiple Choice Options

  • A 374 J
  • B 700 J
  • C 748 J
  • D 350 J

Step-by-Step Verified Solution

ΔQ=nCv    ΔT=n32RΔT

=(67.222.4)(32×8.31)(20)

≈748J

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