It is sometimes appropriate to express the temperature dependence of the heat capacity by the empirical expression Cp,m =a+BT+yT² . Use this expression to estimate the standard enthalpy of combustion of methane at 350 K. Use the standard enthalpy tables in the back of your book in the "Resource Section" (you can also look this up on the internet) and the following data for the empirical constants: 2C.7 CH4 (g) CO₂ (g) O₂ (g) H₂O (1) al(J K-¹ mol-¹) 14.16 26.86 25.72 30.36 B/(mJ K¹ mol-¹) 75.5 6.97 12.98 9.61 Yl(@J K- mol) -17.99 -0.82 -3.868 1.184

Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter15: Energy And Chemical Change
Section: Chapter Questions
Problem 112A: sample of natural gas is analyzed and found to be88.4% methane (CH4) and 11.6% ethane (C2H6) bymass....
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It is sometimes appropriate to express the temperature dependence of the heat capacity by
the empirical expression Cp,m = a + BT+yT²
=a+ßT+yT² . Use this expression to estimate the
standard enthalpy of combustion of methane at 350 K. Use the standard enthalpy tables in
the back of your book in the "Resource Section" (you can also look this up on the internet)
and the following data for the empirical constants: 2C.7
a /(J K¹ mol¹)
14.16
26.86
25.72
30.36
B/(mJ K-¹ mol¯¹) 7/(µJ K-¹ mol¯¹)
75.5
-17.99
6.97
-0.82
12.98
-3.868
9.61
1.184
CH4 (g)
CO₂ (g)
O₂ (g)
H₂O (1)
Note that for ß: mJ = 10³ J and for y: µJ=106 J
Transcribed Image Text:It is sometimes appropriate to express the temperature dependence of the heat capacity by the empirical expression Cp,m = a + BT+yT² =a+ßT+yT² . Use this expression to estimate the standard enthalpy of combustion of methane at 350 K. Use the standard enthalpy tables in the back of your book in the "Resource Section" (you can also look this up on the internet) and the following data for the empirical constants: 2C.7 a /(J K¹ mol¹) 14.16 26.86 25.72 30.36 B/(mJ K-¹ mol¯¹) 7/(µJ K-¹ mol¯¹) 75.5 -17.99 6.97 -0.82 12.98 -3.868 9.61 1.184 CH4 (g) CO₂ (g) O₂ (g) H₂O (1) Note that for ß: mJ = 10³ J and for y: µJ=106 J
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