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Hess's Law

Authored by Erica Britton

Chemistry

9th - 12th Grade

NGSS covered

Used 23+ times

Hess's Law
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20 questions

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1.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Using the equations below:

C(s) + O2(g) → CO2(g) ∆H = –400 kJ

Mn(s) + O2(g) → MnO2(s) ∆H = –500 kJ

what is ∆H (in kJ) for the following reaction?

MnO2(s) + C(s) → Mn(s) + CO2(g) ∆H = ??? kJ

-900 kJ

900 kJ

–100 kJ

100 kJ

Tags

NGSS.HS-PS1-4

2.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Using the equations below

Cu(s) + 1/2O2(g) → CuO(s)H = –156 kJ

2Cu(s) + O2(g) → Cu2O(s)H = –170 kJ

what is the value of ∆H (in kJ) for the following reaction?

CuO(s) → Cu(s) + 1/2O2(g)H = ???? kJ

156 kJ

170 kJ

326 kJ

14 kJ

Tags

NGSS.HS-PS1-4

3.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

The following equations show the oxidation of carbon and carbon monoxide to carbon dioxide.


C(s) +O2(g) CO2(g) ΔH = –x kJ mol–1

CO(g) + O2(g) CO2(g) ΔH = –y kJ mol–1


What is the enthalpy change, in kJ mol–1, for the oxidation of carbon to carbon monoxide?


C(s) + O2(g) CO(g)

x + y

-x - y

y - x

x - y

Tags

NGSS.HS-PS1-4

4.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

The standard enthalpy change of formation values of two oxides of phosphorus are:


P4(s) + 3O2(g) → P4O6(s) ΔHf = –1600 kJ mol–1

P4(s) + 5O2(g) → P4O10(s) ΔHf = –3000 kJ mol–1


What is the enthalpy change, in kJ mol–1, for the reaction below?


P4O6(s) + 2O2(g) → P4O10(s)

+4600

+1400

–1400

–4600

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

5.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

From the following data,

H2 (g) + Cl2 (g) → 2HCl(g) ΔH° = -185 kJ,

2H2 (g) + O2 (g) →2H2O(g) ΔH° = -484 kJ

calculate ΔH° for the following reaction.

4HCl(g) + O2 (g) →2Cl2 (g) + 2H2O(g)

299 kJ

-114 kJ

-299 kJ

114 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

6.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Using the equation below:

C(s) + O2(g) → CO2(g) ∆H = –400 kJ

what is ∆H (in kJ) for the following reaction?

CO2(g) → C(s) + O2(g) ∆H = ?? kJ

+400 kJ

–400 kJ

–800 kJ

Tags

NGSS.HS-PS1-4

7.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Using the equations below:

Mn(s) + O2(g) → MnO2(s) ∆H = –500 kJ

what is ∆H (in kJ) for the following reaction?

MnO2(s) → Mn(s) + O2(g) ∆H = ??? kJ

+500 kJ

–500 kJ

Tags

NGSS.HS-PS1-4

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