A diagram for the energy change during an exothermic reaction is shown.
For which reactions would this be an appropriate diagram?
1 $C{H_4} + 2{O_2} \to C{O_2} + 2{H_2}O$
2 $2{H_2} + {O_2} \to 2{H_2}O$
3 $C + {O_2} \to C{O_2}$
1 )
none of them
2 )
1 and 2 only
3 )
2 and 3 only
all of them
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