Zadanie 17

Standard enthalpy changes of reaction are provided for the following reactions.

C(s) + O₂(g) → CO₂(g)  ΔH^⊖ = −394 kJ

$\ce{H2(g) + 1/2 O2(g) -> H2O(l)}\qquad \Delta H^\ominus = -286\ \mathrm{kJ}$

$\ce{CH3CH2CH2OH(l) + 9/2 O2(g) -> 3CO2(g) + 4H2O(l)}\qquad \Delta H^\ominus = -2021\ \mathrm{kJ}$

What is the standard enthalpy change, in kJ, of the following reaction?

$\ce{3C(s) + 4H2(g) + 1/2 O2(g) -> CH3CH2CH2OH(l)}$

A. (−394 × 3) − (286 × 4) + 2021

B. (394 × 3) + (286 × 4) − 2021

C. (−394 × 3) − (286 × 4) − 2021

D. (394 × 3) + (286 × 4) + 2021