Question

294 joules of heat is required to rise the temperature of 2 moles of an ideal gas at constant pressure from 30°C to 35 C. The amount of heat required
to rise the temperature of the same gas through the same range of temperature at constant volume (R 8.3 Joules/mole/K) is
(A) 126 J
(B) 211
(C)294 J
(D) 378 J​

Answer 1

Answer:

Explanation:

Heat = moles(no.) ×C  

P

​  

×△T

⇒310=2×C  

P

​  

×10[35−25=10]

⇒C  

P

​  

=15.5J/molK

∴C  

P

​  

−C  

V

​  

=R

⇒C  

V

​  

=C  

P

​  

−R=15.5−8.314

⇒C  

V

​  

=7.186J/molK

Q=nC  

V

​  

△T

=2×7.186×10

=143.72J≈144J