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# How much heat is required to react with 186g CaCO3 by following equation CaCO3=CaO+CO2 delta H=42.5kcal.

2.How much heat is required to react with 186g CaCO3 by following equation CaCO3=CaO+CO2 delta H=42.5kcal.

3.Using heats of formation, calculate the heat of formation for MgCl2 by following equation MgCO3+2HCL=MgCl2+CO2+H2O delta H=-23.44 kJ.

4.How much energy will be released by the reaction of 325 grams of Cu2S with HNO3 by following equation 3Cu2S+16HNO3=6Cu(NO3)2+3S+4NO+8H2O delta H=-543 kcal/mole.

5.How much B5H9 must be burned to produce 4500 kcal of energy by following equation 2B5H9+12O2=9H2O+5B2O3 delta H=-4188 kcal/mole

6.Calculate the delta H for the reaction 2N2+5O2-->2N2O5 given the data

H2+1/2O2-->H2O -285.8 kJ/mol

N2O5+H2O-->2HNO3 -76.6 kJ/mol

1/2N2+3/2O2+1/2H2-->HNO3 -174.1 kJ/mol.

Answer in kJ.

7.Given the following two reactions: 2Na+2HCl=2NaCl+H2 delta H=-152.34 kcal H2+Cl2=2HCl delta H=-44.12 kcal. What is delta H reaction, in kcal/mol for NaCl?

8.Calculate the delta reaction of glycerol, (CH2OH)2CHOH, knowing that its heat of combustion is -397.0 kj/mol.

9.Find the delta H for the reaction: 2SO2+2H2O+O2=2H2SO4.

10.Determine the enthalpy of formation in kcal/mole for chloroethane, C2H5Cl, from the following data: H2+1/2O2=H2O delta H=-68.3 kcal ,C+O2=CO2 delta H=-94.1 kcal ,C2H5Cl=C2H4+HCl delta H=17.2 kcal, 2CO2+2H2O=C2H4+3O2 delta H=337.2 kcal, H2+Cl2=2HCl delta H=-44.2 kcal

11.The heat of formation of water is -242 kj/mole. How many joules would be liberated by burning 12 g of hydrogen.

12.Calculate delta H for the reaction Fe2O3+2Al=Al2O3+2Fe by 4Fe+3O2=2Fe2O3+398 kcal and 4Al+3O2=2Al2O3+798 kcal.