Question

The specific heat of air at constant volume is
0.172 Calg! °C-'. The change in internal energy when
5 g of air is heated from 0°C fo 4°C at constant volume
is
(a) 28.8 J
(c) 7.21
(b) 14.45
(d) 3.51)
​

Answer 1

Explanation:

Answer

\Delta E=mC\theta\\ \quad=\cfrac{5}{1000}\times\cfrac{7}{1000}\times\cfrac{4.2}{10}\times4\times100\\ \quad=14.4JΔE=mCθ

=

1000

5

×

1000

7

×

10

4.2

×4×100

=14.4J