   # In which of the following reactions is there a significant transfer of energy as work from the system to the surroundings? This occurs if there is a change in the number of moles of gases. (a) C(s) + O 2 (g) → CO 2 (g) (b) CH 4 (g) + 2 O 2 (g) → CO 2 g) + 2 H 2 O(g) (c) 2 C(s) + O 2 (g) → 2 CO(g) (d) 2 Mg(s) + O 2 (g) → 2 MgO(s) ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 5.4, Problem 2RC
Textbook Problem
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## In which of the following reactions is there a significant transfer of energy as work from the system to the surroundings? This occurs if there is a change in the number of moles of gases. (a) C(s) + O2(g) → CO2(g) (b) CH4(g) + 2 O2(g) → CO2g) + 2 H2O(g) (c) 2 C(s) + O2(g) → 2 CO(g) (d) 2 Mg(s) + O2(g) → 2 MgO(s)

Interpretation Introduction

Interpretation:

The energy transferred reaction should be identified given the four different enthalpy changes reactions.

Concept Introduction:

Equilibrium changes: These only changes equilibrium constant is a change of temperature, if position of equilibrium changed if changes the pressure and temperature like Le chatelier’s principle

Equilibrium mixture: When the concentration of given reactants and products are constant its ratio does not vary it is called equilibrium mixture.

Thermal equilibrium: It is explain that observed higher temperature object which is in constant with a lower temperature object will transfer heat to the lower temperature object.

### Explanation of Solution

Reasons for correct options:

c).2C(s)+O2(g)2CO(g)

This reaction equal amount of product were formed, so this reaction significant transfer of energy as work from the system to the surroundings.

The reaction option (c) has obeyed for transfer of energy as work from the systems hence it serves as the correct option.

Reasons for incorrect options:

a).C(s)+O2(g)CO2(g)b)

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