Determine the heat of combustion of sulfur given these reaction enthalpies: S(s)

Question

Determine the heat of combustion of sulfur given these reaction enthalpies: S(s) + O_2 (g) + SO_2(g) 2 SO_2(g) + O_2(g) rightarrow 2 SO_3 (g) Delta H degree = -186 kJ 2S(s) + 3 O_2(g) rightarrow 2 SO_3(g) Delta H degree = -794 kJ A. -986 kJ B. -304.0 C. -297 kJ D. -594 kJ E. +156.4 kJ Which of the following statement is/are correct? The overlap of two p orbitals in I_2 is called a pi-bond. The overlap between an s orbital and a p orbital is called a sigma-bond. HBr is formed from the overlap of a hydrogen 1s orbital with a bromine sp orbital. A. 1 only B. 2 only C. 3 only D. 1, 2, and 3 E. None How many sigma and pi bonds does each C have in C_2H_2? A. 3 sigma and 1 pi B. 2 sigma and 1 pi C. 2 sigma and 2 pi D. 1 sigma and 2 pi E. 1 sigma and 1 pi

Explanation / Answer

2S(s) + 3O2(g)   -------------> 2SO3(g)   DH = -794Kj

2SO2(g) + O2(g) ------------> 2So3(g)   DH = -186Kj

(-)    (-)                                 (-)                     (+)

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2S(s) + 2O2(g) -----------> 2So2(g)        DH= -608Kj

S(s) + O2(g) -----------> So2(g)        DH= -304Kj >>>>>answer B

2. B 2 only

overlaping s and p orbital of different atoms to form sigma bond

3. c

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