19.5 g of benzene on burning in the free supply of oxygen liberated 12.6 kJ of energy at constant pressure. Calculate the enthalpy of combustion of benzene. Write the thermochemical equation.

19.5 g of benzene on burning in the free supply of oxygen liberated 12

1.	19.5 g of benzene on burning in the free supply of oxygen liberated 12.6 kJ of energy at constant pressure. Calculate the enthalpy of combustion of benzene. Write the thermochemical equation.
Answer» Solution :19.5 GRAMS of benzene on burning liberated 126 kl. 78 grams of benzene on burning liberated 502 KJ. The ENTHALPY of combustion of benzene is` -502 kJmol ^(-1).`The thermochemical equation is given as, `C _(6) H _(6(l)) + (15)/(2) O _(2(g)) to 6CO _(2(g)) + 3H_(2(g)) + 3H _(2) O _((l)), Delta H =-502 kJ mol ^(-1)`