The enthalpies of combustion of S (s), SO 2(g) and H 2(g) are -298.2,-98.7 and -287.3 kJ mol -1. If the enthalpy of reaction SO 3(g)+ H 2 O (l) arrow H 2 SO 4(l) is -130.2 kJ mol -1, the enthalpy of formation of H 2 SO 4(l) would be

Question

The enthalpies of combustion of S (s), SO 2(g) and H 2(g) are -298.2,-98.7 and -287.3 kJ mol -1. If the enthalpy of reaction SO 3(g)+ H 2 O (l) arrow H 2 SO 4(l) is -130.2 kJ mol -1, the enthalpy of formation of H 2 SO 4(l) would be (A) -814.4 kJ mol-1 (B) -650.3 kJ mol-1 (C) -554.2 kJ mol-1 (D) -435.5 kJ mol-1

Tardigrade Admin · Accepted Answer

S + O 2 arrow SO 2 ; Δ H=-298.2 kJ mol-1 SO 2+(1/2) O 2 arrow SO 3 ; Δ H=-98.7 kJ mol -1 H 2+(1/2) O 2 arrow H 2 O ; Δ H=-287.3 kJ mol -1 and SO 3+ H 2 O arrow H 2 SO 4 ; Δ H=-130.2 kJ mol-1. Formation of H 2 SO 4 implies H 2(g)+ S (s)+2 O 2(g) arrow H 2 SO 4(l) and this reaction can be obtained by adding the given four reactions. ∴ Δ H=-298.2+(-98.7)+(-287.3)+(-130.2) =-814.4 kJ mol -1

Q. The enthalpies of combustion of $S_{(s)}, S O_{2 (g)}$ and $H_{2 (g)}$ are -298.2,-98.7 and $- 287.3 k J m o l^{- 1}$ . If the enthalpy of reaction $S O_{3 (g)} + H_{2} O_{(l)} \to H_{2} S O_{4 (l)}$ is $- 130.2 k J m o l^{- 1},$ the enthalpy of formation of $H_{2} S O_{4 (l)}$ would be

$- 814.4 k J m o l^{- 1}$

$- 650.3 k J m o l^{- 1}$

$- 554.2 k J m o l^{- 1}$

$- 435.5 k J m o l^{- 1}$

Q. The enthalpies of combustion of S(s)​,SO2(g)​ and H2(g)​ are -298.2,-98.7 and −287.3kJmol−1. If the enthalpy of reaction SO3(g)​+H2​O(l)​→H2​SO4(l)​ is −130.2kJmol−1, the enthalpy of formation of H2​SO4(l)​ would be

−814.4kJmol−1

−650.3kJmol−1

−554.2kJmol−1

−435.5kJmol−1

Q. The enthalpies of combustion of $S_{(s)}, S O_{2 (g)}$ and $H_{2 (g)}$ are -298.2,-98.7 and $- 287.3 k J m o l^{- 1}$ . If the enthalpy of reaction $S O_{3 (g)} + H_{2} O_{(l)} \to H_{2} S O_{4 (l)}$ is $- 130.2 k J m o l^{- 1},$ the enthalpy of formation of $H_{2} S O_{4 (l)}$ would be

$- 814.4 k J m o l^{- 1}$

$- 650.3 k J m o l^{- 1}$

$- 554.2 k J m o l^{- 1}$

$- 435.5 k J m o l^{- 1}$