The values of heat of formation of SO2 and SO3 are - 298.2 kJ and - 98.2 kJ. The heat of formation of the reaction, SO2 +(1/2)O2 arrow SO3 will be

Question

The values of heat of formation of SO2 and SO3 are - 298.2 kJ and - 98.2 kJ. The heat of formation of the reaction, SO2 +(1/2)O2 arrow SO3 will be (A) + 200 kJ (B) - 356.2 kJ (C) - 200 kJ (D) - 396.2 kJ

Tardigrade Admin · Accepted Answer

Given, (i) S + O 2 longrightarrow SO 2 ; Δ H =-298 ⋅ 2 kJ (ii) S + (3/2) O 2 longrightarrow SO 3 ; Δ H =-98 ⋅ 2 kJ SO 2+(1/2) O 2 longrightarrow SO 3 ; Δ H = ? Subtracting eqn. (i) from eqn. (ii), we get, ⇒ SO 2+(1/2) O 2 longrightarrow SO 3 Δ H =-98 ⋅ 2+298 ⋅ 2=+200 kJ

Q. The values of heat of formation of SO2​ and SO3​ are −298.2kJ and −98.2kJ. The heat of formation of the reaction, SO2​+21​O2​→SO3​ will be

+ 200 kJ

- 356.2 kJ

- 200 kJ

- 396.2 kJ

Given, (i) S+O2​⟶SO2​;ΔH=−298⋅2kJ (ii) S+23​O2​⟶SO3​;ΔH=−98⋅2kJ SO2​+21​O2​⟶SO3​;ΔH= ? Subtracting eqn. (i) from eqn. (ii), we get, ⇒SO2​+21​O2​⟶SO3​ ΔH=−98⋅2+298⋅2=+200kJ

Q. The values of heat of formation of $S O_{2}$ and $S O_{3}$ are $- 298.2 k J$ and $- 98.2 k J$ . The heat of formation of the reaction, $S O_{2} + \frac{1}{2} O_{2} \to S O_{3}$ will be