HELP PLZ?? REALLY URGENT !!!

Balance the following equation:
a. Mg(OH)2+ HCl MgCl2+H2O
b. b. Al(OH)3 Al2O3+H2O
c. c. HNO3+Ca(OH)2 Ca(NO3)2+H2O
d. d. KMnO4 +HCl KCl+ MnCl2+H2O+Cl2
e. e. Cu2S+O2 Cu2O +SO2

Which would freeze at a higher temperature: the great salt lake or lake tahoe? a. lake tahoe would freeze at a higher temperature. b. the great salt lake would freeze at a higher temperature. c. both lakes would freeze at the same temperature.