Two industrial steps are used to generate hydrogen gas

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Two industrial steps are used to generate hydrogen gas. Step A CH₄(g) + H₂O(g) → CO(g) + 3 H₂(g)

\Delta H = +206\,\text{kJ}

Step B CO(g) + H₂O(g) → CO₂(g) + H₂(g)

\Delta H = -41\,\text{kJ}

What is the enthalpy change,

\Delta H

, in kJ, for the net process CH₄(g) + 2 H₂O(g) → CO₂(g) + 4 H₂(g)? (a) +41 (b) +247 (c) +165 (d) -165