Answer:
The correct option is: C. 250 K
Explanation:
Given: <em><u>Before Sublimation-</u></em>
Initial Temperature: T₁ = 300 K, Initial Pressure: P₁ = 1 atm, Initial number of moles of gas: n₁ = 1 mol, given mass of solid Carbon dioxide: w = 88 g
<u><em>After Sublimation- </em></u>
Final Pressure: P₂ = 2.5 atm, Final number of moles of gas: n₂ = ? mol
Final Temperature: T₂ = ? K,
Also, Volume is constant, Molar mass of Carbon dioxide: m = 44 g/mol
As we know,
<em>The number of moles:</em>

<em>So the number of moles of carbon dioxide sublimed:</em>

<em><u>Therefore, the final number of moles of gas after sublimation:</u></em>

<u><em>According to the </em></u><u><em>Ideal gas equation</em></u><u><em>:</em></u>


<em>Since the volume is constant, so the equation (1) can be written as:</em>




<u>Therefore, the final temperature: T₂ = 250 K</u>