If of and of are and kcal

CHEMISTRY · Single correct · CBSE · Chemistry · Thermodynamics · Thermodynamics

Problem

\Delta_f H^\circ

C_2H_4(g)

and

\Delta_f H^\circ

C_2H_6(g)

are

q_1

and

q_2

kcal

mol^{-1}

, then heat of hydrogenation of

C_2H_4(g)

is: (1)

q_2 - q_1

(2)

q_2 + q_1

(3)

q_1 + 2q_2

(4)

q_1 - q_2