Question

When heat energy of 1500 Joules, is supplied to a gas at constant pressure$2.1 \times 10^{5}N ⥂ / ⥂ m^{2}$, there was an increase in its volume equal to$2.5 \times 10^{- 3}m^{3}$. The increase in internal energy of the gas in Joules is

• A. 450
• B. 525
• C. 975
• D. 2025

Answer 1

Answer: (C)

975

Answer 2

According to FLOT

$\Delta Q = \Delta U + P(\Delta V)$ ⇒ $\Delta U = \Delta Q - P(\Delta V)$

$= 1500 - (2.1 \times 10^{5})(2.5 \times 10^{- 3})$ =975 Joule