﻿ Gasoline burns according to the following equation:n2C8H18(l - science mathematics
Gasoline burns according to the following equation:n2C8H18(l

## Gasoline burns according to the following equation:n2C8H18(l

[From: Chemistry] [author: ] [Date: 01-07] [Hit: ]
(a) What happens to the enthalpy during this reaction? Explain. (b) What happens to the entropy during this reaction? Explain. all help is appreciated, thank you!......

(a) What happens to the enthalpy during this reaction? Explain.

(b) What happens to the entropy during this reaction? Explain.

all help is appreciated, thank you!
-------------------------------------------------------

Dr W say: dHrxn = dHf(products) - dHf(reactants)
dSrxn = dSf(products) - dSf(reactants)

from these tables
https://en.wikipedia.org/wiki/Standard_e...
http://www.mrbigler.com/misc/energy-of-f...
https://www.chemeo.com/cid/45-400-7/Octa...

species.. .. . ..dHf (kJ/mol).. .. .. .. .. .dSf (J/molK)
C8H18(l).. .. .. .. -208.4.. ... .. .. ... .. .+359.8
O2(g).. ... ... ... .. .. .0.. ... ... ... .. ... . .+205.0
CO2(g).. .. ... .. .. -393.5.. ... ... ... .. . +213.6
H2O(g).. ... ... ... .-241.8.. .. ... .. ... .. +188.7

so.. for the reaction
.. 2 C8H18 + 25 O2 ---> 16 CO2 + 18 H2O

dHrxn = (16*(-393.5) + 18*(-241.8)) - (2*(-208.4) - 25*(0)) = -10200 kJ

dSrxn = (16*(214) + 18*(189)) - (2*(360) - 25*(205)) = +621 J/molK
'
*********
the - value for dHrxn means energy is given off by the reaction. We all know that right? we burn gasoline and heat is given off

why do you suppose dS is + ???
-
wfect say: ospegrks
-
wfipo say: rovtrkgz
-

keywords: ,Gasoline burns according to the following equation:n2C8H18(l
New
Hot
© 2008-2010 science mathematics . Program by zplan cms. Theme by wukong .