Using the following thermochemical equations (i) S(rh)+3/2 O2(g) xrightarrow[]SO3(g) Δ H=-2x kJ mol-1 (ii) SO2(g)+1/2 O2(g) xrightarrowSO3(g) Δ H=-y kJ mol-1 . Find out the heat of formation of SO2(g) in kJ mol-1 .

Question

Using the following thermochemical equations (i) S(rh)+3/2 O2(g) xrightarrow[]SO3(g) Δ H=-2x kJ mol-1 (ii) SO2(g)+1/2 O2(g) xrightarrowSO3(g) Δ H=-y kJ mol-1 . Find out the heat of formation of SO2(g) in kJ mol-1 . (A)  (2x+y)  (B)  (x+y)  (C)  (2x/y)  (D)  (y-2x)

Tardigrade Admin · Accepted Answer

Given S(rh)+(3/2)O2(g) xrightarrow[]SO3(g); Δ H=-2x kJ mol-1 ...(i) SO2(g)+(1/2)O2(g) xrightarrow[]SO3(g); Δ H=-y kJ mol-1 ...(ii) S(s)+O2(g) xrightarrowSO2(g); Δ H=? Subtract Eq (ii) from Eq (i) a S(rh)+(3/2)O2(g) xrightarrowSO3(g); Δ H=-2x text kJ text mol-1 SO2(g)+(1/2)O2(g) xrightarrowSO3(g); Δ H=-y kJ mol-1 underline- - - + S(rh)+( (3/2)-(1/2) )O2(g) xrightarrowSO2(g); Δ H=(-2x+y) kJ mol-1 S(rh)+O2(g) xrightarrow[]SO2(g); Δ H=(y-2x)kJ mol-1

Q. Using the following thermochemical equations
(i) $S_{(r h)} + 3/2 O_{2}_{(g)} S O_{3}_{(g)}$ $Δ H = - 2 x k J m o l^{- 1}$
(ii) $S O_{2}_{(g)} + 1/2 O_{2}_{(g)} S O_{3}_{(g)}$ $Δ H = - y k J m o l^{- 1}$ .
Find out the heat of formation of $S O_{2} (g)$ in $k J$ $m o l^{- 1}$ .

$(2 x + y)$

$(x + y)$

$(2 x / y)$

$(y - 2 x)$

$(2 x - y)$

Q. Using the following thermochemical equations (i) S(rh)​+3/2O2​(g)​​SO3​(g)​ ΔH=−2xkJmol−1 (ii) SO2​(g)​+1/2O2​(g)​​SO3​(g)​ ΔH=−ykJmol−1. Find out the heat of formation of SO2​(g) in kJ mol−1 .

(2x+y)

(x+y)

(2x/y)

(y−2x)