Thermochemical Equations

Question 1

Which of these statements are true? Select all that apply.

Revolt · Accepted Answer

The Hf for Br2(I) is 0 kJ/mol.; The Hf for Hg(I) is 0 kJ/mol.; The Hf for Cl2(g) is 0 kJ/mol.

Question 2

This reaction is ✔ endothermicexothermic.

Revolt · Accepted Answer

✔ endothermic

Question 3

What is the enthalpy of reaction for the decomposition of calcium carbonate?CaCO3(s) Right arrow. CaO(s) + CO2(g) ⇒ 656.3 kJ

Revolt · Accepted Answer

656.3

Question 4

What is the enthalpy of combustion when 1 mol C6H6(g) completely reacts with oxygen?2C6H6(g) + 15O2(g) 12CO2(g) + 6H2O(g)

Revolt · Accepted Answer

–3169 kJ/mol

Question 5

The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is –5074 kJ/mol. The reaction equation is: C8H18(l) + 12.5O2(g) [image 1] 8CO2(g) + 9H2O(g).What is the [image 2] Hf for this reaction?16CO2(g) + 18H2O(g) [image 3] 2C8H18(l) + 25O2(g) kJ

Revolt · Accepted Answer

10148

Question 6

It is important for scientists to know how much energy is given off or absorbed in a chemical reaction. Which options below would indicate an exothermic reaction?

Revolt · Accepted Answer

H = –; Energy is considered a product in the reaction: A + B C + D + energy; Energy is released in the reaction.

Thermochemical Equations Answers

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