Question

Using the bond energies below determine the value and sign of delta H for 2H-Br +...

Using the bond energies below determine the value and sign of delta H for

2H-Br + F-F → 2H-F + Br-Br

Bond energies in kJ/mol: H-Br 362 H-F 565 F-F 155 Br-Br 190

When a mole of C5H12 is combusted it reacts with 8 moles of O2.

A. How many moles of CO2 are produced ?

B. How many moles of H2O are produced ?

Homework Answers

Answer #1

Ans. 1. dHrxn = dHproducts- dHreactants

Or, dHrxn = [2 x bond energy, HF + bond energy, Br-Br] – [2 x bond energy, HBr + bond energy, F-F]

Or, dHrxn = [2 x 565 kJ/mol + 190 kJ/mol] – [2 x 362 kJ/mol + 155 kJ/mol]

                = [1130 kJ/mol + 190 kJ/mol ] – [724 kJ/mol + 155 kJ/mol]

Hence, dHrxn = + 441 kJ/ mol

Ans. 2. C5H12 + 8 O2 --------> 5 CO2 + 6H2O

A. 5 moles of CO2 produced from combustion of 1 mol of C5H12

B. 6 moles of CO2 produced from combustion of 1 mol of C5H12

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