Question

A.) When 1 mole of CO(g) reacts with Cl2(g) to form COCl2(g) according to the following...

A.) When 1 mole of CO(g) reacts with Cl2(g) to form COCl2(g) according to the following equation, 108 kJ of energy are evolved.

CO(g) + Cl2(g)---->COCl2(g)

Is this reaction endothermic or exothermic? _________

What is the value of q?__________ kJ

B.) When 1 mole of CO(g) reacts with H2O(l) to form CO2(g) and H2(g) according to the following equation, 2.80 kJ of energy are absorbed.

CO(g) + H2O(l)---->CO2(g) + H2(g)

Is this reaction endothermic or exothermic? ______________

What is the value of q? __________ kJ

C.) Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels. The heat of combustion of cyclopentane, C5H10, is 786.6 kcal/mol.

Write a balanced equation for the complete combustion of cyclopentane.

__________+__________----> __________+__________

How much energy is released during the complete combustion of 392 grams of cyclopentane ? __________ kcal

Homework Answers

Answer #1

A) Since heat is evolved, i.e. Heat is given out to the surroundings, the reaction is exothermic. It produces heat during the reaction.

The value of q in case of exothermic reactions is always negative.

Hence, value of q= - 108kj

B)Since in this case, energy is absorbed, instead of evolved, therefore the reaction is termed as endothermic i.e. Absorbing heat.

The value of q in endothermic reactions is always positive

Hence, value of q = +2.8 kJ

C) The balanced reaction is given as follows :

2C5H10 + 15O2 ===> 10CO2 + 10H2O

We first need to calculate number of moles in 392 g of cyclopentane:

Molecular weight of cyclopentane = 70g / mol

Hence, moles = given weight / molecule weight = 392 / 70 = 5.6

Heat of combustion = moles * heat of combustion / mol = 5.6 * 786.6 kcal/mol = 4404.96 kcal

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