question_answer

\[S+\frac{3}{2}{{O}_{2}}\to S{{O}_{3}}+2x\,kcal\]                 \[S{{O}_{2}}+\frac{1}{2}{{O}_{2}}\to S{{O}_{3}}+y\,kcal\]                 Find out the heat of formation of \[S{{O}_{2}}\] [AIIMS 1997; CBSE PMT 1999; KCET 1999]

A)                 \[2x-y\]               

B)                 \[2x+y\]

C)                 \[x+y\]

D)                 \[2x/y\]