Molecule of a gas can be modelled as three sphere connected through three rigid rods as to make triangle like structure. A gas containing such molecules performs 25 J of work when it expands at constant pressure. Heat given to gas is:
Correct answer: B. 100 J
- A. 75 J
- B. 100 J
- C. 150 J
- D. 125 J
Explanation
This is the following solution: (this formula must be memorised by the students because other questions may come following the same formula) f for triatomic gases is = 6 f/2 + 1 = 6/2 + 1 = 4 Q = 4R (W) Q = 4R (25) Q = 100J
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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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