Question

To calculate the enthalpy change for the reaction, 2CO (g) + O2 (g) → 2 CO2 (g), you can use ΔHf° values for each reactant and product.

Which setup shows how the enthalpy change should be calculated?



ΔH°reaction = [ΔHf° CO2(g)] – [ΔHf° CO(g) + ΔHf° O2(g)]


ΔH°reaction = [2ΔHf° CO2(g)] – [2Δ Hf° CO(g) + ΔHf° O2(g)]


ΔH°reaction = [2ΔHf° CO(g) + ΔHf° O2(g)] – [2ΔHf° CO2(g)]


ΔH°reaction = [2ΔHf° CO(g) – ΔHf° O2(g)] + [2ΔHf° CO2(g)]

Answer 1

well according to my research just now
reactants are before the arrow
and products are the terms that follow the arrow

and I looked up the formula and the formula is:
\[\Delta H^o=\sum n H^o_{f_{ \text{products}}}- \sum m H^o_{f_{ \text{reactants}}}\]
if that helps

Answer 2

still trying to figure out the n and m
and the H type symbol there in the formula