The specific heat of air at constant volume is 0.172 Cal g-1 ° C -1. The change in internal energy when 5 g of air is heated from 0 ° C to 4 ° C at constant volume is

Question

The specific heat of air at constant volume is 0.172 Cal g-1 ° C -1. The change in internal energy when 5 g of air is heated from 0 ° C to 4 ° C at constant volume is (A) 28.8 J (B) 14.4 J (C) 7.2 J (D) 3.51 J

Tardigrade Admin · Accepted Answer

Given: Specific heat of air =0172 Cal / gC Mass of air =5 g Initial temperature =0 C Final temperature =4 C Solution: At constant volume the change in internal energy is given by, Δ U = mC p triangle T As, triangle T =4-0=4 C Substituting the values we get, Δ U =3.44 Cal Also, 1 Cal =4.2 J ∴ triangle U =4.2 J × 3.44=14.188 J ∼ 14.4 J

Q. The specific heat of air at constant volume is $0.172 C a l g^{- 1}^{\circ} C^{- 1}$ . The change in internal energy when $5 g$ of air is heated from $0^{\circ} C$ to $4^{\circ} C$ at constant volume is

$28.8 J$

$14.4 J$

$7.2 J$

$3.51 J$

Q. The specific heat of air at constant volume is 0.172Calg−1∘C−1. The change in internal energy when 5g of air is heated from 0∘C to 4∘C at constant volume is

28.8J

14.4J

7.2J

3.51J

Q. The specific heat of air at constant volume is $0.172 C a l g^{- 1}^{\circ} C^{- 1}$ . The change in internal energy when $5 g$ of air is heated from $0^{\circ} C$ to $4^{\circ} C$ at constant volume is

$28.8 J$

$14.4 J$

$7.2 J$

$3.51 J$