First slide

Enthalpy of formation

Question

$Δ_{f}^{0} H$ is positive for the compound

Moderate

A

HCl
B

NO
C

${SO}_{3}$
D

${NH}_{3}$

Solution

$\frac{1}{2} N_{2} (g) + \frac{1}{2} O_{2} (g) \to NO (g), ∆ H = + 90 kJ / mole$

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