A hypothetical reaction, `A rarr 2B`, proceeds via following sequence of steps
`{:(ArarrC,,DeltaH = q_(1),,,),(CrarrD,,DeltaH = q_(2),,,),((1)/(2)D rarrB,,DeltaH = q_(3),,,):}`
The heat of reaction is

Options

A. `q_(1) - q_(2) +2q_(3)`
B. `q_(1) +q_(2) - 2q_(2)`
C. `q_(1)+q_(2) +2q_(3)`
D. `q_(1) +2q_(2) - 2q_(3)`

Explanation

`{:(ArarrC,,DeltaH = q_(1),,,),(CrarrD,,DeltaH = q_(2),,,),(Drarr2B,,DeltaH = q_(3)xx2,,,):}`
Adding all three equaitons, we get
`A rarr 2B, DeltaH = q_(1) +q_(2) +2q_(3)`