5.The heat combustion of acetylene, , at 25°C, is -1299 kJ/mol. At this temperature, the enthalpy of formation for and are -393 and -286 kJ/mol, respectively. Calculate for acetylene.
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, at 25°C, is -1299 kJ/mol. At this temperature, the enthalpy of formation 
for 
and 
are -393 and -286 kJ/mol, respectively. Calculate 
for acetylene.