ScienceChemistryHeatChemistry 4.09 Quiz: Writing Thermochemical Equations Cheat Sheet
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Chemistry 4.09 Quiz: Writing Thermochemical Equations Cheat Sheet

Xena Cook avatar Xena Cook
25 July 2022
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question
Which of the following is a correctly written thermochemical equation?
answer
C3H8(g) + O2(g) โ†’ CO2(g) + H2O(l), ฮ”H = 2,220 kJ/mol
question
How does a phase change affect a thermochemical equation?
answer
It can affect the ฮ”H value.
question
For the reaction, CH4 (g) + 2O2 (g) โ†’ CO2 (g) + 2H2O (l), ฮ”H = -890 kJ, what will be the change in enthalpy when 3 moles of methane react in excess oxygen?
answer
-2.67 ร— 103 kJ
question
In which of the following thermochemical equations would the ฮ”H be considered a heat of solution?
answer
NH4Cl (s) โ†’ NH4 (aq) + Cl- (aq), ฮ”H = +14.8 kJ/mol
question
Which of the following enthalpies of reaction would the reaction represented by the diagram have?
answer
ฮ”H < 0