HWW Item 17 Part A Use standard enthalpies of formation to calculate H rxn for t

Question

HWW Item 17

Part A

Use standard enthalpies of formation to calculate Hrxn for the following reaction.
2NaHCO3(s)Na2O(s)+2CO2(g)+H2O(g)

Express your answer using four significant figures.Hrxn =________kJ

Part B

Use standard enthalpies of formation to calculate Hrxn for the following reaction.
Mg(OH)2(s)MgO(s)+H2O(g)

Express your answer using three significant figures.Hrxn =________kJ

Part C

Use standard enthalpies of formation to calculate Hrxn for the following reaction.
Ca(OH)2(s)CaO(s)+H2O(g)

Express your answer using three significant figures.Hrxn =________kJ

Part D

Use standard enthalpies of formation to calculate Hrxn for the following reaction.
Cr2O3(s)+3CO(g)2Cr(s)+3CO2(g) Express your answer using three significant figures.Hrxn =________kJ

Explanation / Answer

Question 1.

H(rxn) = [ H°f(products)- H°f(reactants))

From literature, H°f(NaHCO3) = -950.8 kJ/mol

H°f(Na2O) = -414.2 kJ/mol

H°f(CO2) = -393.5 kJ/mol

H°f(H2O(g)) = -241.8 kJ/mol

H(rxn) =[ H°f(Na2O) + 2×H°f(CO2) + H°f(H2O)] - [2×H°f(NaHCO3)]

H(rxn) = 458.6 kJ/ mol

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