Question

A sample of air weighing 1.18 g occupies 1.0 x 10³ J cm³ when kept at 300 K and 1.5x10⁵ Pa. When 2.0 cal of heat is added to it at constant volume, its temperature increases by 1°C. Calculate the amount of heat needed to increase the temperature of air by 1°C at constant pressure if the mechanical equivalent of heat is 4.2 x 10⁷ erg/cal. Assume that air behaves as an ideal gas.

Answer 1

m = 1.18 g, V = 1 × 10³ cm³ = 1 L T = 300 k, P = 10⁵ Pa