Enthalpy of Reaction

Question 1

Which equation(s) do you need to reverse in order to calculate the overall equation for the formation of HCN and H2 from NH3 and CH4? Check all that apply.

Revolt · Accepted Answer

N2(g) + 3H2(g) 2NH3(g); C(s) + 2H2(g) CH4(g)

Question 2

What must you do before adding the equations?

Revolt · Accepted Answer

multiply the second equation by 2

Question 3

What is the overall equation for the reaction that produces P4O10 from P4O6 and O2?

Revolt · Accepted Answer

p4O6(s) + 2O2(g) P4O10(s)

Question 4

Which equation shows how to calculate Hrxn for the equation below?

Revolt · Accepted Answer

–802 kJ – 88 kJ

Question 5

The enthalpy diagram to the right represents a set of thermochemical equations. Which set of equations could it represent?

Revolt · Accepted Answer

A + B C H1 = 800 kJC + D E + 2F H2 = - 200 kJF + D B H3 = - 300 kJ

Question 6

Select the true statement about the diagram.

Revolt · Accepted Answer

It represents one reaction.

Question 7

Select the true statement about the diagram.

Revolt · Accepted Answer

It can be used for a Hess's law calculation.

Enthalpy of Reaction Answers

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