Question

Consider the reaction at 300 K

H2 (g) + Cl2 (g) $\longrightarrow$ 2HCl (g) ; $\Delta$H⁰ = – 185 Kj

If 2 mole of H2 completely react with 2 mole of Cl2 to form HCl. What is $\Delta$U⁰ for this reaction ?

• A. 0
• B. – 185 Kj
• C. 370 kJ
• D. – 370 kJ

Answer 1

Answer: (D)

– 370 kJ

Answer 2

$\Delta$ng = 0 $\Rightarrow$ $\Delta$H⁰ = $\Delta$U⁰

For 2 mole $\Delta$U⁰ = – 370 kJ.