Consider the following equations.

     \({\text{2Fe(s)}} + {\text{1}}\frac{1}{2}{{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{F}}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{(s) }}\)     \(\Delta {{\text{H}}^\Theta } = x\)

     \({\text{CO(g)}} + \frac{1}{2}{{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{C}}{{\text{O}}_{\text{2}}}{\text{(g)}}\)     \(\Delta {{\text{H}}^\Theta } = y\)

What is the enthalpy change of the reaction below?

\[{\text{F}}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{(s)}} + {\text{3CO(g)}} \to {\text{3C}}{{\text{O}}_{\text{2}}}{\text{(g)}} + {\text{2Fe(s)}}\]

A.     \(3y - x\)

B.     \(3y + x\)

C.     \( - 3y - x\)

D.     \( - 3y + x\)

A

This question was answered correctly by nearly 85% of the candidates which was encouraging.