For a monoatomic ideal gas of 3 moles, Cp -Cv is:
Correct answer: D. 3R
- A. R/3
- B. 3/2 R
- C. 2R
- D. 3R
Explanation
Cp-Cv=nR Where n= no. of moles, hence Cp-Cv=3R making D the correct option.
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About Molar Specific Heat of a Gas
Molar specific heat is the heat required to raise the temperature of one mole of a gas by one kelvin, expressed through Q = nCΔT. Questions compare the constant volume value Cv with the constant pressure value Cp, apply the ideal gas relation Cp − Cv = R, and identify how the thermodynamic process affects heat capacity.
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If Cp = 20 J/mol.K then for 1 mole gas we get Cv= _. You can use Cp/Cv = 1.7.