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Q.

A sealed flask with a capacity of 2 dm3 contains 11 g of propane gas. The flask is so weak that it will burst if the pressure becomes 2 MPa. The minimum temperature at which the flask will burst is _______ °C. [Nearest integer] (Given: R = 8.3 J K–1 mol–1. Atomic masses of C and H are 12u and 1u respectively.) (Assume that propane behaves as an ideal gas.)

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answer is 1655.

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Detailed Solution

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Moles of C3H8=1144=0.25 moles 

PV = nRT

⇒2×106×2×10−3=0.25×8.3×T⇒T=1927.710K=1654.56∘C

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