X (g) + 4Y (g) →2Z (g), ΔH∘=-75.0 kJ Before the reaction, the volume of the gaseous mixture was 5.00 L. After the reaction, the volume was 2.00 L. Calculate the value of the total energy change, ΔE, in kilojoules.

Question

Chemistry

Karly Ryan

16 May, 07:09

X (g) + 4Y (g) →2Z (g), ΔH∘=-75.0 kJ Before the reaction, the volume of the gaseous mixture was 5.00 L. After the reaction, the volume was 2.00 L. Calculate the value of the total energy change, ΔE, in kilojoules.

+4

Answers (1)

Know the Answer?

Amelia Daniels · Answer 1

Isobaric transition, first law: H=ΔU+w for a gas expansion: w = P ext ∗ΔV to convert to joules, you need the gas constants. R = 0.08206 L atm/mol*K, R=8.314 J/mol*K w = P ext ∗ΔV∗ 8.314 J/mol∗K 0.08206 L atm/mol∗K ΔU=ΔH-[ P ext ∗ΔV∗ 8.314 J/mol∗K 0.08206 L atm/mol∗K ] ΔU=-75000 J-[ (43.0atm) ∗ (2-5) L∗ 8.314 J 0.08206 L atm ] Then you need to convert to kJ. by the way U=E, internal energy.