An open vessel at 27 o C is heated until 3/8 th of the air in it has been expelled. Assuming that the volume remains constant, calculate the temperature at which the vessel was heated

Question

An open vessel at 27 o C is heated until 3/8 th of the air in it has been expelled. Assuming that the volume remains constant, calculate the temperature at which the vessel was heated, 307 o C, 107 o C, 480 o C, 207 o C

MARKS App · Accepted Answer

If 3 t h 8 of the air is expelled out then remaining air = 5 8 In the open vessel volume and pressure are both constant but moles are decreasing ∴ n 1 T 1 = n 2 T 2 ∴ n 1 × 300 = 5 8 n 1 T 2 ∴ T 2 = 8 5 × T 1 = 8 5 × 300 = 480 K = 480 − 273 = 207 o C

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