What is ΔH∘rxn for the following chemical reaction?
CS2(g)+2H2O(l)→CO2(g)+2H2S(g)

Question

What is ΔH∘rxn for the following chemical reaction?
CS2(g)+2H2O(l)→CO2(g)+2H2S(g)

zaxoanl · Answer

C + 2S -> CS2      116.7kj
2H2 + O2 -> 2H2O      -285.8kj
C + O2 -> CO2     -393.5kj
H2 + S -> H2S -20.6kj

i got -265.6kj but its wrong i dont know which part i did wrong please help 

-(116.7)+(285.8)+(-393.5)+(-20.6*2)=-265.6 kj

jfraser · Answer

the $\Delta H_{rxn}$ is always products - reactants, so you need to swap the order

jfraser · Answer

the setup should be: $$\Delta H_{rxn} = \left[\Delta H(CO_2) + 2\Delta H(H_2S)\right] - \left[\Delta H(CS_2) + 2\Delta H(H_2O)\right]$$

zaxoanl · Answer

ty