A reaction involves three steps

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

A reaction

X \rightarrow Y

involves three steps. If -

X \rightarrow A; \Delta H = -a

kcal ... (i) -

B \rightarrow A; \Delta H = -b

kcal ... (ii) -

B \rightarrow Y; \Delta H = -c

kcal ... (iii) then

\Delta H

for

X \rightarrow Y

is: (1)

a + b + c

(2)

b - a - c

(3)

a + b - c

(4)

c + b - a