Help, will become fan. Multiple choice. Please its really confusing for me..

Question

anonymous · Answer

attachment

anonymous · Answer

@thomaster

aaronq · Answer

$$\Delta H _{f}(rxn)=\Sigma \nu _{i} H _{f _{i}}(products)-\Sigma \nu _{i} H _{f _{i}}(reactants)$$

aaronq · Answer

basically, multiply the enthalpy of formation of each species by it's stoichiometric coefficient and subtract the values of the reactants from the products' values

anonymous · Answer

So I set the equation up like this 3co(-110.5) + 2Fe2O3(-822.1) ---> Fe(0.0) + 3CO2(-393.5) now idk what to do next? @aaronq

anonymous · Answer

@thomaster can you help me please?

aaronq · Answer

multiply it and subtract it

anonymous · Answer

Multiply which ones tho @aaronq

aaronq · Answer

each value by it's coefficient
you should make 2 tables like this|dw:1368575762982:dw|

anonymous · Answer

So do I do -110.5 + -822.1 - 0.0 + -393.5 ? @aaronq

aaronq · Answer

you need to multiply each one by it's coefficient then subtract what you got from the reactants from the products

anonymous · Answer

May I ask whats its coefficient?