If a gas absorbs 200 J of heat and expand by 500 cm3 against a constant pressure of 2× 105Nm-2, the change in internal energy is:

Question

If a gas absorbs 200 J of heat and expand by 500 cm3 against a constant pressure of 2× 105Nm-2, the change in internal energy is: (A) - 300 joule (B) +100 joule (C) - 100 joule (D) None of these

Tardigrade Admin · Accepted Answer

From first law of thermodynamics, Change in internal energy is Δ U=q-w=q-P Δ V =200-2 × 105 × 500 × 10-6 =100 J

Q. If a gas absorbs 200 J of heat and expand by $500 c m^{3}$ against a constant pressure of $2 \times 10^{5} N m^{- 2},$ the change in internal energy is:

- 300 joule

+100 joule

- 100 joule

None of these

From first law of thermodynamics,
Change in internal energy is
$Δ U = q - w = q - P Δ V$
$= 200 - 2 \times 1 0^{5} \times 500 \times 1 0^{- 6}$
$= 100 J$

Q. If a gas absorbs 200 J of heat and expand by 500cm3 against a constant pressure of 2×105Nm−2, the change in internal energy is: