Question

70 calories of heat is required to raise the temperature of 2 moles of an ideal diatomic gas at constant pressure from 30⁰C to 35⁰C. The amount of heat required (in calories) to raise the temperature of the same gas through the same range (30⁰C to 35⁰C) at constant volume is –

• A. 30
• B. 50
• C. 70
• D. 90

Answer 1

Answer: (B)

50

Answer 2

Q₁ = nC_PDT, Q₂ = nC_VDT

$\frac { \mathrm { Q } _ { 2 } } { \mathrm { Q } _ { 1 } }$ = $\frac { 70 } { 1.4 }$=50cal