Question

Part A) Calculate ΔHrxn for the reaction CaO(s)+CO2(g)→CaCO3(s) given these reactions and their ΔH values: Ca(s)+CO2(g)2Ca(s)++12O2(g)O2(g)→→CaCO3(s),2CaO(s),ΔH=−814.1 kJΔH=−1269.8 kJ Express the enthalpy in kilojoules to one decimal place.

Part B)

Calculate Δ Hrxn for the following reaction:

CH4(g)+4Cl2(g)→CCl4(g)+4HCl(g)

given these reactions and their ΔH values:

C(s)C(s)H2(g)+++2H2(g)2Cl2(g)Cl2(g)→→→CH4(g),CCl4(g),2HCl(g),ΔH=−74.6 kJΔH=−95.7 kJΔH=−184.6 kJ

Express the enthalpy in kilojoules to one decimal place.

Part c)

The thermite reaction, in which powdered aluminum reacts with copper oxide, is highly exothermic.

2Al(s)+3CuO(s)→Al2O3(s)+3Cu(s)

Use standard enthalpies of formation to find ΔH∘rxn for the thermite reaction.

Express your answer using one decimal place and include the appropriate units

Answer 1