Multiple choice

One mole of a non-ideal gas undergoes a change of state (1.0 atm, 2.0 L, 195 K) to (2.0 atm, 3.5 L, 345 K) with a change in internal energy, ΔU = 15 L atm. The change in enthalpy (ΔH) of the process is ________.

  1. 20.0 L atm

  2. 22.0 L atm

  3. 20.5 L atm

  4. 25.0 L atm

  5. 15.0 L atm

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A Correct answer
Explanation

ΔH = ΔU + Δ(PV) = ΔU + (P2V2 - P1V1) = 15.0 L atm + (2.0 atm x 3.5 L) - (1.0 atm x 2.0 L) = 20.0 L atm.