3.1.4 Energetics

When 0.10 g of propane was burned the quantity of heat evolved was 5.0 kJ. The enthalpy of combustion of propane in kJ mol⁻¹ is

• −800

• −1500

• −2200

• −2900

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Using the data below, which is the correct value for the standard enthalpy of formation for TiCl₄(l)?

• −1538 kJ mol⁻¹

• −1094 kJ mol⁻¹

• −750 kJ mol⁻¹

• +286 kJ mol⁻¹

Tags

NGSS.HS-PS1-4

When ethanamide (CH₃CONH₂) burns in oxygen the carbon is converted into carbon dioxide, the hydrogen is converted into water and the nitrogen forms nitrogen gas.

Using the data above, which one of the following is a correct value for the enthalpy of combustion of ethanamide?

• −1823 kJ mol⁻¹

• −1183 kJ mol⁻¹

• −1000 kJ mol⁻¹

• −360 kJ mo1⁻¹

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

In which one of the following reactions is the standard enthalpy change equal to the standard enthalpy of formation of lithium fluoride?

• Li(g) + F(g) → LiF(s)

• Li⁺(g) + F⁻(g) → LiF(s)

• Li⁺(aq) + F⁻(g) → LiF(s)

• Li(s) + 0.5F₂(g) → LiF(s)

Tags

NGSS.HS-PS1-4

What is the temperature rise, in K, when 504 J of heat energy are absorbed by 0.110 kg of solid iron?

Specific heat capacity of iron = 0.448 J K⁻¹ g⁻¹

• 9.78 × 10⁻²

• 1.02 × 10¹

• 2.83 × 10²

• 1.02 × 10⁴

Tags

NGSS.HS-PS3-4

What is the enthalpy of formation of buta-1,3-diene, C₄H₆(g)?

• +112 kJ mol^–1

• –112 kJ mol^–1

• +746 kJ mol^–1

• –746 kJ mol^–1

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

The table shows the standard enthalpy of formation, Δ_fH^θ, for some of the substances in the reaction

C₂H₆(g) + 6F₂(g) ⟶ C₂F₆(g) + 6HF(g) ΔH^θ = −2898 kJ mol⁻¹

What is the standard enthalpy of formation, in kJ mol⁻¹, for HF(g)?

• −1638

• −273

• +273

• +1638

Tags

NGSS.HS-PS1-4

This question is about the reaction given below.

CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g)

Enthalpy data for the reacting species are given in the table.

The standard enthalpy change for this reaction of carbon monoxide and steam is

• +42 kJ mol⁻¹

• −42 kJ mol⁻¹

• +262 kJ mol⁻¹

• −262 kJ mol⁻¹

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Use the information in the image to answer this question.

The standard enthalpy of combustion of butane, in kJ mol⁻¹, is

• −2880

• −2590

• −806

• −554

Tags

NGSS.HS-PS1-4

Use the information in the image to answer this question.

The value in kJ mol⁻¹ of the enthalpy of thermal dissociation when butane forms propane, hydrogen and carbon is

• −26.3

• −17.5

• +17.5

• +21.2