Question

5 kilomoles of oxygen is heated at constant pressure. The temperature of the oxygen gas is increased from 295 K to 305 K. If the molar heat capacity of oxygen at constant pressure is 6.994 kcal/kmole K. The amount of heat absorbed in kcal,

• A. 249.7
• B. 44
• C. 349.7
• D. 539.7

Answer 1

The correct option is C 349.7

The heat absorbed at constant pressure follows the relation:

$q_p=n{C}_p\Delta T$ (where n = no. of moles of gas, $C_p$ = Molar heat capacity)

$\Rightarrow q_p=5kmole\times 6.994\frac{kcal}{kmoleK}\times (305-295)K$

$\Rightarrow q_p=349.7kcal$