Consider the reaction: 2brf3(g) --> br2(g) + 3f2(g)

using standard absolute entropies at 298k, calculate the entropy change for the system when 1.62 moles of brf3(g)react at standard conditions.

Answer : The entropy change of reaction for 1.62 moles of reacts at standard condition is 217.68 J/K

Explanation :

The given balanced reaction is,

The expression used for entropy change of reaction is:

where,

= entropy change of reaction = ?

n = number of moles

= standard entropy of formation

= 245.463 J/mol.K

= 202.78 J/mol.K

= 292.53 J/mol.K

Now put all the given values in this expression, we get:

Now we have to calculate the entropy change of reaction for 1.62 moles of reacts at standard condition.

From the reaction we conclude that,

As, 2 moles of has entropy change = 268.74 J/K

So, 1.62 moles of has entropy change =

Therefore, the entropy change of reaction for 1.62 moles of reacts at standard condition is 217.68 J/K

law of conservation of matter