Standard Enthalpy Change of Formation Quiz

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What is the standard enthalpy change of reaction represented by?

ΔH° (reaction) = ΣΔHf° (p) × ΣΔHf° (r)

ΔH° (reaction) = ΣΔHf° (p) + ΣΔHf° (r)

ΔH° (reaction) = ΣΔHf° (r) - ΣΔHf° (p)

ΔH° (reaction) = ΣΔHf° (p) - ΣΔHf° (r) (correct)

What is the value of the enthalpy of formation of carbon dioxide in kJ/mol?

-241.8

-393.5 (correct)

-110.5

0

What type of process is bond-breaking?

Isothermal

Endothermic (correct)

Exothermic

Isobaric

What is the ΔH° (reaction) value for the reaction CO (g) + H2O (g) → CO2 (g) + H2 (g)?

41.2 kJ/mol Signup and view all the answers

Under standard conditions, what is the enthalpy change of a reaction represented by?

ΔH° Signup and view all the answers

What occurs when new bonds are formed in a reaction?

Energy is released Signup and view all the answers

What is the significance of Hess's Law in measuring enthalpy changes?

It proves that the energy change in a reaction is always the same, regardless of the pathway. Signup and view all the answers

What is the unit of enthalpy change (ΔH)?

kJ Signup and view all the answers

Which of the following is an example of an indirect method of measuring enthalpy changes?

Hess's Law Signup and view all the answers

What is the ΔH° for the reaction 2H2(g) + O2(g) → 2H2O(g), given that H2(g) + ½O2(g) → H2O(l) ΔH° = -44kJ?

-88 kJ Signup and view all the answers

What is the difference between ΔH and ΔH°?

ΔH is for non-standard conditions, while ΔH° is for standard conditions. Signup and view all the answers

What is the heat of formation of a compound?

The enthalpy change for a reaction involving the formation of the compound from its elements. Signup and view all the answers

What is the Standard Enthalpy Change of Formation (ΔHf0) of an element in its normal physical state under standard conditions?

0 Signup and view all the answers

What type of reaction is represented by the equation Mg(s) + ½ O2(g) → MgO(s)?

Formation reaction Signup and view all the answers

What is the sign of the enthalpy change (ΔH) for a reaction that releases heat?

-ve Signup and view all the answers

What is the Standard Enthalpy Change of Atomization (ΔHat0) for the reaction ½ H2(g) →H(g)?

+218 KJ/mol Signup and view all the answers

What is the Standard Enthalpy Change of Combustion (ΔHc0) for the reaction CH4 + 2O2 → CO2 + 2H2O?

-890.4 KJ/mol Signup and view all the answers

What is the characteristic of a reaction that has a positive enthalpy change (ΔH)?

Endothermic reaction Signup and view all the answers