AnswersFoothill-B Period-Chemistry-2627BEnthalpy of Reaction

Enthalpy of Reaction Answers

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1
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What is the equation for the overall reaction obtained by adding these equations?

A
Option
B
Option
C
Option
3
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What is the overall reaction equation?

A
Option
B
Option
C
Option
4

What is the equation for the overall reaction obtained by adding these equations?

A
Option
B
Option
C
Option
5

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.

A
N2(g) + 3H2(g) 2NH3(g)
B
C(s) + 2H2(g) CH4(g)
C
4H2(g) + 2C(s) + N2(g) 2HCN(g) + 3H2(g)
6

What is the overall equation for the reaction that produces NaCl and O2 from Na2O and Cl2?

A
Option
B
Option
C
Option
7

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

Question illustration
A
–802 kJ + 88 kJ
B
802 kJ + 88 kJ
C
–802 kJ – 88 kJ
8

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

A
A + B C H1 = - 500 kJC + D E + 2F H2 = 100 kJF + D B H3 = 200 kJ
B
A + B C H1 = 800 kJC + D E + 2F H2 = - 200 kJF + D B H3 = - 300 kJ
C
A + D E H1 = 500 kJD F H2 = - 300 kJ
9

Select the true statement about the diagram.

A
It shows an endothermic reaction.
B
It represents one reaction.
C
It can be used for a Hess's law calculation.
10

Select the true statement about the diagram.

A
It shows an exothermic overall reaction.
B
It represents only one reaction.
C
It can be used for a Hess's law calculation.

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