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Chapter 14: Q14.162CP (page 624)

Bromine monofluoride (BF) disproportionates to bromine gas and bromine tri- and pentafluorides. Use the following to find 螖Horxnfor the decomposition of BrF to its elements:

3BrF(g)鈫�Br2(g)+BrF3(l)螖Horxn=-125.3KJ\hfill5BrF(g)鈫�2Br2(g)+BrF5(l)螖Horxn=-166.1KJ\hfillBrF3(l)+F2鈫�(g)BrF5(l)螖Horxn=-158.0KJ\hfill

Short Answer

Expert verified

Enthalpy of reaction followed as:

8BrF(g)鈫�2BrF3(l)+3Br2g+F2(g)螖Horxn=-138.4KJ

Step by step solution

01

Enthalpy of reaction

It is defined as the heat of the action which is calculated to find out how much energy is required by the reaction to convert it鈥檚 one more into products that is equal to the change in energy of the system. a positive value indicates the reaction is endothermic that is heat is required and a negative value indicates the reaction is exothermic that heat is released.

02

Enthalpy of the given reaction

To calculate the enthalpy of reaction when Bromine monofluoride (BF) disproportionates to bromine gas and bromine tri- and pentafluorides followed as:

As given:

As enthalpy is equal to

螖Horxn=-125.3KJ-166.1KJ+158.0KJ=-138.4KJ

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Most popular questions from this chapter

Boron nitride (BN) has a structure similar to graphite, but is a white insulator rather than a black conductor. It is synthesized by heating diboron trioxide with ammonia at about 1000掳C.

(a) Write a balanced equation for the formation of BN; water forms also.

(b) Calculate 螖H掳rxnfor the production of BN (螖H掳fof BN is -254kJmol-1).

(c) Boron is obtained from the mineral borax, Na2B4O7.10H2O. How much borax is needed to produce 0.1kg of BN, assuming 72% yield?

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