1. Tardigrade
  2. Question
  3. Chemistry
  4. A fish swimming in water body when taken out from the water body is covered with a film of water of weight 36 g. When it is subjected to cooking at 100° C, then the internal energy for vaporization in kJ mol -1 is [nearest integer] [Assume steam to be an ideal gas. Given A text vap H ominus for water at 373 K and 1 bar is 41.1 kJ mol -1 ; R =8.31 JK -1 mol -1 ]

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Q. A fish swimming in water body when taken out from the water body is covered with a film of water of weight $36\, g$. When it is subjected to cooking at $100^{\circ} C$, then the internal energy for vaporization in $kJ \,mol ^{-1}$ is ___ [nearest integer]
[Assume steam to be an ideal gas. Given $A _{\text {vap }} H ^{\ominus}$ for water at $373 \,K$ and $1$ bar is $41.1 \,kJ \,mol ^{-1} ; R =8.31 \,JK ^{-1} \,mol ^{-1}$ ]

JEE MainJEE Main 2022Thermodynamics

Solution:

$H _{2} O (l) \rightarrow H _{2} O ( g )$
$n =\frac{36}{18}=2 \,mol$
$\Delta U =\Delta H -\Delta n _{ g } RT$
$=41.1-\frac{1 \times 8.31 \times 373}{1000} kJ / mol$
$=38\, kJ / mol$