a. Several standard enthalpies of formation are given below. Use these data to c
ID: 474437 • Letter: A
Question
a. Several standard enthalpies of formation are given below. Use these data to calculate the standard enthalpy of vaporization of bromine.
Br(g)
111.9
Br2()
Br2(g)
30.9
Hvap° =____ kJ/mol
Several standard enthalpies of formation are given below.
Br(g)
111.9
Br2()
Br2(g)
30.9
b. Calculate the energy required for the following reaction:
Br2(g) 2 Br(g)
(This is the Br – Br bond dissociation enthalpy.)
disH° = ____ kJ/mol-rxn
a. Several standard enthalpies of formation are given below. Use these data to calculate the standard enthalpy of vaporization of bromine.
Species Hf° (kJ/mol)Br(g)
111.9
Br2()
0Br2(g)
30.9
Hvap° =____ kJ/mol
Explanation / Answer
a)
Br2 (l) ----------------------> Br2 (g) it is vapourization
Hvap° = Hproducts - Hreactants
= 30.9 - 0
= 30.9 kJ / mol
b)
Br2(g) 2 Br(g)
Hdis° = Hproducts - Hreactants
= 2 x 111.9 - 30.9
= 192.9 kJ / mol
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