Calculate the standard entropy change for the industrial synthesis of urea (a common fertilizer): co2(g) + 2 nh3(g) → co(nh2)2(s) + h2o(ℓ) at 25◦c. patel (smp4358) – 28: fall exam review part three – lyssy – (112476) 8 s ◦ co2(g) 213.74 j k·mol nh3(g) 192.45 j k·mol co(nh2)2(s) 104.6 j k·mol h2o(ℓ) 69.91 j k·mol answer in units of j k · mol.

Answer : The standard entropy change is, -424.1 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 change

= 104.6 J/mol.K

= 69.91 J/mol.K

= 213.74 J/mol.K

= 192.45 J/mol.K

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

Therefore, the standard entropy change is, -424.1 J/K

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .