Chemistry: Matter and Change

Section 4: Calculating Enthalpy Change

Self Check Quizzes

1
The standard enthalpy (heat) of formation is ________.
A)The change in enthalpy that accompanies the formation of one gram of a compound in its standard state from elements in their standard states.
B)The change in enthalpy that accompanies the formation of one kilogram of a compound in its standard state from elements in their standard states.
C)The change in enthalpy that accompanies the formation of one liter of a compound in its standard state from elements in their standard states.
D)The change in enthalpy that accompanies the formation of one mole of a compound in its standard state from elements in their standard states.
2
Elements in their standard state always have standard enthalpies of ________.

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A)-396 kJ/mol
B)33.2 kJ/mol
C)0.0 kJ/mol
D)396 kJ/mol
3
What heat is liberated in the formation of 10.0 grams of sulfur hexafluoride, SF6, from the elements sulfur and fluorine?

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A)83.5 kJ
B)1220 kJ
C)12,200 kJ
D)17,800 kJ
4
From the following data, H2 (g) + Cl2 (g) → 2HCl(g) ΔH°v = -185 kJ, 2H2 (g) + O2 (g) → 2H2O(g) ΔH° = -483.7 kJ, calculate ÎH° for the following reaction.

4HCl(g) + O2 (g) → 2Cl2 (g) + 2H2O(g)
A)299 kJ
B)-114 kJ
C)-299 kJ
D)114 kJ
5
Calculate ΔH° for the following reaction. The standard enthalpies of formation for the two reactants and two products are, in order, -1118, -110.5, -272, -393.5

Fe3O4(s) + CO(g) → 3FeO(s) + CO2(g)
A)-263 kJ
B)54 kJ
C)19 kJ
D)-50 kJ
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