User talk:Mansoor-23

July 2023
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Third law of thermodynamics and its limitation.
i believe residual entropy to be a limitation of the Third Law of Thermodynamics as the Third Law of Thermodynamics states that at absolute zero (-273.15 kelvin) entropy (S) of a system is zero.

mathematically stated as;

S - S o = K B L n  Ω

for a perfect crystal Ω=1

∴ S - S o =  K B  Ln (1)

S - S o = 0      ( L n (1) = 0)

when initial entropy of a perfect crystal at absolute 0 is 0

then, S - 0 = 0

S = 0

thus entropy of a perfect crystal at absolute 0 is 0.

but if there is no entropy at absolute zero then how does the concept of Residual entropy get in. hence where there is Residual entropy there is limitation of Third Law of Thermodynamics. Mansoor-23 (talk) 06:08, 11 July 2023 (UTC)

preparation of Nitric acid(HNO3) by Ostwald's process in a simple three step technique;
STEP 1:    4NH 3  +  5O 2     -->   4NO (g) + 6H 2 O (g)

STEP 2:    2NO (g)  +  O 2(g)    -->    2NO 2(g)

STEP 3:    3NO 2(g)  +   H 2 O   -->     2HNO  3  (aq)  +  NO (g)

HENCE THE PREPARATION OF AQUEOUS NITRIC ACID ( HNO 3 ). Mansoor-23 (talk) 07:25, 11 July 2023 (UTC)