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SAT® Subject Test in Chemistry

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Difficult

Hess's Law

SATCHM-6RRJXH

$$N_2(g) + 2O_2(g) → 2NO_2(g)$$

Determine the enthalpy change for the reaction shown above provided the information below.

$$N_2(g) + O_2(g) → 2NO(g) \ ΔH = +180 \ kJ$$

$$2NO_2(g) → 2NO(g) + O_2(g) \ ΔH = +110 \ kJ$$

A

$-70 kJ$

B

$+290 kJ$

C

$+70 kJ$

D

$-290 kJ$

E

$1.6 kJ$