Question

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 –

• A. 75 J
• B. 100 J
• C. 150 J
• D. 125 J

Answer 1

Answer: (B)

100 J

Answer 2

For isobaric process

$\frac{Q}{W}$= $\frac{K + 2}{K}$ [K = degree of freedom]

Q = $\frac{6 + 2}{2}$ × 25 = 100 J