The equation is $4$FeS$($s$)+7$O$2($g$)->2$Fe$2$O$3($s$)+4$SO$2($g$),$ the release is $251$ kJ

a $)$ State whether reaction is exothermic or endothermic

b $)$ Re$-$write the reaction with energy as a product or reactant $($ whichever is appropriate$)$

c $)$ Rewrite the reaction with the energy term written separately, to the right.

d$)$ Draw and label a potential energy diagram that describes the reaction