first of all, we find change in entropy while boiling
NOTE - THE BOILING POINT TEMPERATURE OF LIQUID NITROGEN IS -195.8 °C
specific heat = 1040 J / Kg oC
s
= Q / T = mL / T = 4.20 * 201e3 / ( -195.8 + 273.15) = 10914.027
J/K
Now when it warms
average temperature , T = 77.35 + ( 273.15 + 25 ) / 2 = 187.75 K
s'
= 4.20 * 1040 * ( - 195.8 - 25) / 187.75
s'
= 5137 J/K
so,
total change
S
= 16051 J/K
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