ThermochemistryMedium

Question

Benzene burns in oxygen according to the following reactions.

C6H6(l) + 15/2 O2(g) → 3H2O(l) + 6CO2(g)

If the standard enthalpies of formation of C6H6(l), H2O(l) and CO2(g) are 11.7, −68.1 and −94 kcal/ mole, respectively, the amount of heat that will liberate by burning 780 g of benzene is

Options

A.7800 kcal
B.780 kcal
C.78 kcal
D.608.4 kcal

Solution

$\Delta_{c}{H^{o}}_{\text{Benzene}} = \Delta_{r}H$

$= \sum_{}^{}{\Delta_{f}H_{\text{Products}}} - \sum_{}^{}{\Delta_{f}H_{\text{Reactants}}} = 7800\text{ kcal}$

Create a free account to view solution

View Solution Free
Topic: Thermochemistry·Practice all Thermochemistry questions

More Thermochemistry Questions

NH3(g) + 3Cl2(g) → NCl3(g) + 3HCl(g) ; ᐃH1N2(g) + 3H2(g) → 2NH3(g) ; ᐃH2H2(g) + Cl2(g) → 2...Find the bond energy of S−S bond from the following data.C2H5 − S − C2H5(g): ΔHof = −148 kJ,C2H5 − S − S − C2H5(g): ΔHof...Enthalpy of neutralization of oxalic acid is −25.4 kcal/mol using strong base, NaOH. Enthalpy change for the process H2C...Heat absorbed in the reaction H2(g) + Cl2(g) → 2HCl(g) is 182 kJ. Bond energies of H–H = 430 kJ/mole and Cl–Cl = 242 kJ/...Heat of neutralisation of CsOH with all strong acid is 13.4 kcal mol-1. The heat released on neutralisation of CsOH with...