,
,Q: 7
(a)
(i) Define the term electron affinity. [2]
(ii) Define the term lattice energy. [2]
(b) Use the following data and relevant data from the Data Booklet
to calculate a value for the enthalpy change of formation of zinc
bromide, ZnBr2 (s). You might find it helpful to construct an
energy cycle. [4]
• electron affinity of Br (g) = –325kJ mol–1
• enthalpy change of atomisation of Zn (s) = +131kJ mol–1
• enthalpy change of vaporisation of Br2 (l) = +31kJ mol–1
• lattice energy of ZnBr2 (s) = –2678kJ mol–1
, Solution
,Q: 7
(a)
(i) Define the term electron affinity. [2]
(ii) Define the term lattice energy. [2]
(b) Use the following data and relevant data from the Data Booklet
to calculate a value for the enthalpy change of formation of zinc
bromide, ZnBr2 (s). You might find it helpful to construct an
energy cycle. [4]
• electron affinity of Br (g) = –325kJ mol–1
• enthalpy change of atomisation of Zn (s) = +131kJ mol–1
• enthalpy change of vaporisation of Br2 (l) = +31kJ mol–1
• lattice energy of ZnBr2 (s) = –2678kJ mol–1
, Solution
