Chemistry: An Atoms-Focused Approach (Second Edition)
Chemistry: An Atoms-Focused Approach (Second Edition)
2nd Edition
ISBN: 9780393614053
Author: Thomas R. Gilbert, Rein V. Kirss, Stacey Lowery Bretz, Natalie Foster
Publisher: W. W. Norton & Company
Question
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Chapter 19, Problem 19.112QA
Interpretation Introduction

To calculate:

The fuel values of liquid formamide and methyl formate.

Expert Solution & Answer
Check Mark

Answer to Problem 19.112QA

Solution:

Fuel value of liquid formamide = 12.00 kJ/g.

Fuel value of liquid methyl formate = 16.11 kJ/g.

Explanation of Solution

1) Concept:

We are asked to calculate the fuel value for liquid formamide and methyl formate. The enthalpy of formation for both in the units kJ/mol is given. Fuel value is the amount of heat given off when one gram of fuel is burned. We are given enthalpy of formation for formaldehyde and formic acid; we will write the combustion reactions of formaldehyde and formic acid and using the Hf0 values for reactants and products, we calculate the H°comb values for both. Fuel value for compounds are measured in kJ/g. So, we would convert the energies from kJ/mol to kJ/g using molar masses for formaldehyde and formic acid to get the fuel values for both.

2) Given:

Standard enthalpy of formation for liquid formamide, H°f=-251 kJ/mol

Standard enthalpy of formation for liquid methyl formate H°f=-391 kJ/mol

Mass of one mole of formamide = 45.0407g

Mass of one mole of methyl formate = 60.0516 g

3) Calculations:

Combustion reaction of formamide can be written as:

4CH3NOl+9O2g4CO2g+6H2Ol+4NO2(g)

H°comb= nproductsHf, products0- nreactantsHf, reactants0

From Appendix 4, the H0 values for CO2g,H2Ol and NO2g are -393.5 kJ/mol,-285.8 kJ/mol and 33.2 kJ/mol.

Using these values and the above equation, let’s calculate the Hcomb0 value for formamide as:

H°comb=6mol×-285.8 kJmol+ 4mol×-393.5 kJmol+4mol×33.2 kJmol-4mol × -251 kJmol+9mol×0 kJmol

H°comb=-3156 kJ--1004kJ= -2152 kJ

Calculating fuel value for formamide as:

-2152 kJ4 mol×1mol45.0407 g=11.94 kJ/g

Thus, the fuel value of formamide is 12.0kJg

Combustion reaction of methyl formate is written as:

C2H4O2l+2O2g2CO2g+2H2Ol

H°comb= nproductsHf, products0- nreactantsHf, reactants0

From Appendix 4, the H0 values for CO2g and H2Ol are -393.5 kJ/mol and -285.8 kJ/mol respectively.

Using these values and the above equation, let’s calculate the Hcomb0 value for methyl formate as:

H°comb=2mol×-285.8kJmol+ 2mol×-393.5 kJmol-1 mol × -391 kJmol+2mol×0kJmol

H°comb=-1358.6 kJ--391.0= -967.6 kJ

Calculating fuel value for methyl formate as:

967.6 kJ1 mol×1mol60.0516 g= 16.11 kJ/g

Thus, the fuel value of methyl formate is 16.11kJg

Conclusion:

Fuel value of liquid formamide is smaller than that of liquid methyl formate.

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Chapter 19 Solutions

Chemistry: An Atoms-Focused Approach (Second Edition)

Ch. 19 - Prob. 19.11VPCh. 19 - Prob. 19.12VPCh. 19 - Prob. 19.13QACh. 19 - Prob. 19.14QACh. 19 - Prob. 19.15QACh. 19 - Prob. 19.16QACh. 19 - Prob. 19.17QACh. 19 - Prob. 19.18QACh. 19 - Prob. 19.19QACh. 19 - Prob. 19.20QACh. 19 - Prob. 19.21QACh. 19 - Prob. 19.22QACh. 19 - Prob. 19.23QACh. 19 - Prob. 19.24QACh. 19 - Prob. 19.25QACh. 19 - Prob. 19.26QACh. 19 - Prob. 19.27QACh. 19 - Prob. 19.28QACh. 19 - Prob. 19.29QACh. 19 - Prob. 19.30QACh. 19 - Prob. 19.31QACh. 19 - Prob. 19.32QACh. 19 - Prob. 19.33QACh. 19 - Prob. 19.34QACh. 19 - Prob. 19.35QACh. 19 - Prob. 19.36QACh. 19 - Prob. 19.37QACh. 19 - Prob. 19.38QACh. 19 - Prob. 19.39QACh. 19 - Prob. 19.40QACh. 19 - Prob. 19.41QACh. 19 - Prob. 19.42QACh. 19 - Prob. 19.43QACh. 19 - Prob. 19.44QACh. 19 - Prob. 19.45QACh. 19 - Prob. 19.46QACh. 19 - Prob. 19.47QACh. 19 - Prob. 19.48QACh. 19 - Prob. 19.49QACh. 19 - Prob. 19.50QACh. 19 - Prob. 19.51QACh. 19 - Prob. 19.52QACh. 19 - Prob. 19.53QACh. 19 - Prob. 19.54QACh. 19 - Prob. 19.55QACh. 19 - Prob. 19.56QACh. 19 - Prob. 19.57QACh. 19 - Prob. 19.58QACh. 19 - Prob. 19.59QACh. 19 - Prob. 19.60QACh. 19 - Prob. 19.61QACh. 19 - Prob. 19.62QACh. 19 - Prob. 19.63QACh. 19 - Prob. 19.64QACh. 19 - Prob. 19.65QACh. 19 - Prob. 19.66QACh. 19 - Prob. 19.67QACh. 19 - Prob. 19.68QACh. 19 - Prob. 19.69QACh. 19 - Prob. 19.70QACh. 19 - Prob. 19.71QACh. 19 - Prob. 19.72QACh. 19 - Prob. 19.73QACh. 19 - Prob. 19.74QACh. 19 - Prob. 19.75QACh. 19 - Prob. 19.76QACh. 19 - Prob. 19.77QACh. 19 - Prob. 19.78QACh. 19 - Prob. 19.79QACh. 19 - Prob. 19.80QACh. 19 - Prob. 19.81QACh. 19 - Prob. 19.82QACh. 19 - Prob. 19.83QACh. 19 - Prob. 19.84QACh. 19 - Prob. 19.85QACh. 19 - Prob. 19.86QACh. 19 - Prob. 19.87QACh. 19 - Prob. 19.88QACh. 19 - Prob. 19.89QACh. 19 - Prob. 19.90QACh. 19 - Prob. 19.91QACh. 19 - Prob. 19.92QACh. 19 - Prob. 19.93QACh. 19 - Prob. 19.94QACh. 19 - Prob. 19.95QACh. 19 - Prob. 19.96QACh. 19 - Prob. 19.97QACh. 19 - Prob. 19.98QACh. 19 - Prob. 19.99QACh. 19 - Prob. 19.100QACh. 19 - Prob. 19.101QACh. 19 - Prob. 19.102QACh. 19 - Prob. 19.103QACh. 19 - Prob. 19.104QACh. 19 - Prob. 19.105QACh. 19 - Prob. 19.106QACh. 19 - Prob. 19.107QACh. 19 - Prob. 19.108QACh. 19 - Prob. 19.109QACh. 19 - Prob. 19.110QACh. 19 - Prob. 19.111QACh. 19 - Prob. 19.112QACh. 19 - Prob. 19.113QACh. 19 - Prob. 19.114QACh. 19 - Prob. 19.115QACh. 19 - Prob. 19.116QACh. 19 - Prob. 19.117QACh. 19 - Prob. 19.118QACh. 19 - Prob. 19.119QACh. 19 - Prob. 19.120QACh. 19 - Prob. 19.121QACh. 19 - Prob. 19.122QACh. 19 - Prob. 19.123QACh. 19 - Prob. 19.124QACh. 19 - Prob. 19.125QACh. 19 - Prob. 19.126QACh. 19 - Prob. 19.127QACh. 19 - Prob. 19.128QACh. 19 - Prob. 19.129QACh. 19 - Prob. 19.130QACh. 19 - Prob. 19.131QACh. 19 - Prob. 19.132QACh. 19 - Prob. 19.133QACh. 19 - Prob. 19.134QACh. 19 - Prob. 19.135QACh. 19 - Prob. 19.136QACh. 19 - Prob. 19.137QACh. 19 - Prob. 19.138QACh. 19 - Prob. 19.139QACh. 19 - Prob. 19.140QACh. 19 - Prob. 19.141QACh. 19 - Prob. 19.142QA
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