Calorimetry

Question 1

Which substances have Hf = 0 kJ/mol by definition? Select all that apply.

Revolt · Accepted Answer

A: O2(g); D: Br2(l); E: Fe(s); F: He(g)

Question 2

Water forms according to the equation below:2H2(g) + O2(g) 2H2O(g) Hrxn = -483.64 kJHow much energy is released during the formation of 1 mol H2O(g)? kJ

Revolt · Accepted Answer

A: -241.82

Question 3

The synthesis reaction to form boron hydride is: 2B(s) + 3H(g) BH(g), H = +36 KJ. What is the enthalpy value for the manipulated reaction: 1/2BH(g) B(s) + 3/2H(g)?

Revolt · Accepted Answer

A: –18 KJ

Question 4

Is this reaction endothermic or exothermic?

Revolt · Accepted Answer

B: exothermic

Calorimetry Answers

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