For the equilibrium reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the Δn?

A. 0
B. 1
C. 2
D. -1

Answer: -1

Additional Information: Δn = moles of gaseous products - moles of gaseous reactants = 2 - (1 + 3) = -1.

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