Page 380 - SUBSEC October 2017_Neat
P. 380
- 7 -
DO NOT WRITE IN THIS AREA
(v) Calculate the lattice energy of MX(s).
[3 marks]
(d) Account for the difference in the lattice energy for MgCl (s) and NaCl(s).
2
..............................................................................................................................................
DO NOT WRITE IN THIS AREA
..............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
..............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
[4 marks]
(e) Explain why the molar enthalpy changes for the following reactions have identical values.
HCl (aq) + NaOH (aq) → NaCl (aq) + H O (l)
2
H SO (aq) + 2KOH (aq) → K SO (aq) + 2H O (l)
DO NOT WRITE IN THIS AREA
2 4 2 4 2
..............................................................................................................................................
..............................................................................................................................................
.............................................................................................................................................
[2 marks]
Total 30 marks
GO ON TO THE NEXT PAGE
02112020/CAPE/SPEC 2017
‘‘*’’Barcode Area”*”
Sequential Bar Code
