Answer to Question #27282 in Inorganic Chemistry for faith gituma
C3H3 +5O2=3CO2+4H2O+488KJ what is the value of heat produced (enthalpy)
According to the chemical equation this combusting reaction is exotermic(the heat is released to the surrounding (+488 kJ)).
But the system is loosing the heat. Enthalpy views the process from the side of the system. That's why it's negative in the exotermic reactions
dH = -488kJ
Answer: dH = -488 kJ