June 2018 NY Regents Chemistry Exam

44 Based on Table *I*, what is the Δ*H *value for the production of 1.00 mole of NO2(g) from its elements at 101.3 kPa and 298 K?
(1) +33.2 kJ

(2) -33.2 kJ

(3) +132.8 kJ

(4) -132.8 kJ

**Solution:** All we need to do is take a look at Table I and find the correct ΔH value for the correct equation.

In the equation there is 2 in front of NO2 signifying two moles. We are looking for ΔH value for one mole. +66.4/2=+33.2

Answer: 1

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