🧪 TheChemSolverUSNCO / General Chemistry
ThermodynamicsMCQ

The enthalpy change for which reaction represents the standard enthalpy of formation for hydrogen cy — Thermodynamics Chemistry Question

Question

The enthalpy change for which reaction represents the standard enthalpy of formation for hydrogen cyanide, HCN?

A.

H(g) + C(graphite) + N(g) → HCN(g)

B.

1/2 H2(g) + C(graphite) + 1/2 N2(g) → HCN(g)

✓ Correct
C.

HCN(g) → 1/2 H2(g) + C(graphite) + 1/2 N2(g)

D.

H2(g) + 2C(graphite) + N2(g) → 2HCN(g)

💬
Still have doubts about this question?
Practice more questions like this, completely free.

Practice USNCO / General Chemistry questions like this — free

4,000+ questions across AP Chemistry, USNCO, and IChO — all free, no signup required.

Explore AP Chemistry →Try Interactive Labs