Chemistry 4.09 Quiz: Writing Thermochemical Equations Cheat Sheet

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For the reaction, CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l), ΔH = -890 kJ, what will be the change in enthalpy when 3 moles of methane react in excess oxygen?

-2.67 × 103 kJ

Which of the following is a correctly written thermochemical equation?

C3H8(g) + O2(g) → CO2(g) + H2O(l), ΔH = 2,220 kJ/mol

How does a phase change affect a thermochemical equation?

It can affect the ΔH value.

In which of the following thermochemical equations would the ΔH be considered a heat of solution?

NH4Cl (s) → NH4 (aq) + Cl- (aq), ΔH = +14.8 kJ/mol

Which of the following enthalpies of reaction would the reaction represented by the diagram have?

ΔH < 0


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