Verified Solution • 2025–26 Session moderate

QJEEM19Phabfe: JEE Main 2019 Physics - Class 11 JEEM19Phabfe Solution: Two moles of helium gas is mixed with three moles of hydrogen…

Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the molar specific heat of mixture at constant volume ? (R = 8.3 J/mol K)

Multiple Choice Options

  • A 21.6 J/mol K
  • B 17.4 J/mol K
  • C 15.7 J/mol K
  • D 19.7 J/mol K

Step-by-Step Verified Solution

fmix=n1f1+n2f2n1+n2
⇒2×3+3×55=215

Cv=fR5=215×R2=17.4 J/mol K

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