Air Acetylene
October 15, 2009 | Posted by admin
Air Acetylene
change in heat of formation?
also need help on what eqution(s) to use on this problem…
Acetylene burns in air according to the following equation.
C2H2(g) + 5/2 O2(g) 2 CO2(g) + H2O(g) H0rxn = -1255.8 kJ
Given that H0f of CO2(g) = -393.5 kJ/mol and H0f of H2O(g) = -241.8 kJ/mol, what is H0f of C2H2(g)?
By definition, the enthalpy of the above reaction is given by, in terms of heat of formation, as
dH = dH0 H2O + 2 dH0 CO2 – dH0 C2H2 where d is the delta symbol.
Thus upon rearrangement
dH0 C2H2 = dH0 H2O + 2 dH0 CO2 – dH
= -1255.8 -241.8 -2 x 393.5
= -2284.6 kJ/mol
The heat of formation fo C2H2 is -2284.6 kJ/mol
Check the maths
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