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18 Nov 2019

Dry chemical hand warmers utilize the oxidation of iron to form iron oxide according to the following reaction:

4Fe(s)+3O2(g)→2Fe2O3(s)

Standard thermodynamic quantities for selected substances at 25 ∘C

Reactant or product ΔH∘f(kJ/mol)
Fe(s) 0.0
O2(g) 0.0
Fe2O3(s) −824.2

Part A

Calculate ΔH∘rxn for this reaction.

Express the energy in kilojoules to one decimal place.
ΔH∘rxn = kJ

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Patrina SchowalterLv2
24 Aug 2019

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Related questions

Dry chemical hand warmers utilize the oxidation of iron to form iron oxide according to the following reaction: 4 Fe(s) + 3 O2(g) ? 2 Fe2O3(s). Calculate ?Ho for this reaction and calculate how much heat is produced from a hand warmer containing 15.0 g of iron powder.

 

Standard thermodynamic quantities for selected substances at 25∘C

Substance ΔH∘f(kJ/mol)
Rb(s) 0.0
Rb(g) 80.9
Cl(g) 121.3
Cl2(g) 0.0
RbCl(s) −435.4
Pb(s) 0.0
Pb(g) 195.2
Pb(NO3)2(s) −451.9
N(g) 472.7
N2(g) 0.0
O(g) 249.2
O2(g) 0.0
O3(g) 142.7

Part A:

What is the value of ΔH∘f for the formation of 1 mol of RbCl(s)?

Express the energy to four significant figures and include the appropriate units.

Part B

Enter the chemical equation for the formation of Pb(NO3)2(s) from its respective elements in their standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Question 1

Iron is made from a reaction of iron oxide with carbon monoxide in the following reaction:

Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)

Using Hess' Law, calculate the enthalpy of reaction given:

C(s) + O2(g) → CO2(g) ΔH = -393.5 kJ/mol

2 Fe(s) + 3/2 O2(g) → Fe2O3(s) ΔH = -824.2 kJ/mol

C(s) + 1/2 O2(g) → CO(g) ΔH = -110.5 kJ/mol

Question 2

Use Hess' Law to calculate enthalpy of reaction for the following equation:

2 N2(g) + 5 O2(g) → 2 N2O5(g)

Given:

2 H2(g) + O2(g) → 2 H2O(l) ΔH = -571.6 kJ/mol

N2O5(g) + H2O(l) → 2 HNO3(l) ΔH = -76.6 kJ/mol

1/2 N2(g) + 3/2 O2(g) + 1/2 H2(g) → HNO3(l) ΔH = -174.1 kJ/mol

Question 3

Using standard enthalpies of formation, determine the ΔHreaction for the following equations:

2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(g)

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