   Chapter 12, Problem 12CR ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

#### Solutions

Chapter
Section ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
1 views

# Methane, CH 4 , is the major component of natural gas. Methane burns in air, releasing approximately 89 0  kJ of heat energy per mole.msp;  CH 4 ( g )   +  2O 2 ( g ) →   CO 2 ( g )   +  2H 2 ( g ) What quantity of heat is released if 0. 521 mole of methane is burned? What quantity of heat is released if 1 . 25 g of methane is burned? What quantity of methane must have reacted if 125 0  kJ of heat energy was released?

Interpretation Introduction

(a)

Interpretation:

The quantity of heat released after burning of 0.521mole of methane is to be calculated.

Concept Introduction:

The heat that is released by the reaction or absorbed by the reaction is known as heat of the reaction or enthalpy of the reaction. The enthalpy change is denoted by ΔH. The enthalpy change is calculated by the formula,

ΔH=qheatreleased or absorbed bythereaction/moles.

Explanation

The given moles of methane is 0.521mole.

The heat absorbed or released per mole by the reaction is 890kJ/mol.

The enthalpy change is calculated by the formula,

ΔHheatreleasedor absorbedpermole=qheatreleased or absorbed per molebythereactionmoles

Interpretation Introduction

(b)

Interpretation:

The quantity of heat released after burning of 1.25g of methane is to be calculated.

Concept Introduction:

The heat that is released by the reaction or absorbed by the reaction is known as heat of the reaction or enthalpy of the reaction. The enthalpy change is denoted by ΔH. The enthalpy change is calculated by the formula,

ΔH=qheatreleased or absorbed bythereaction/moles.

Interpretation Introduction

(c)

Interpretation:

The quantity of methane that is obtained after releasing 1250kJ of heat energy is to be calculated.

Concept Introduction:

The heat that is released by the reaction or absorbed by the reaction is known as heat of the reaction or enthalpy of the reaction. The enthalpy change is denoted by ΔH. The enthalpy change is calculated by the formula,

ΔH=qheatreleased or absorbed bythereaction/moles.

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