In thermal decomposition of C2H5Br(g) to C2H4(g) and HBr(g), the initial pressure changes from 200 mm to 390 mm of Hg at the end of reaction. Percentage of C2H5Br(g) undecomposed, when pressure of mix

Question

In thermal decomposition of C2H5Br(g) to C2H4(g) and HBr(g), the initial pressure changes from 200 mm to 390 mm of Hg at the end of reaction. Percentage of C2H5Br(g) undecomposed, when pressure of mixture was 342.5 mm of Hg, is

Prashant Kotian · Accepted Answer

Correct answer: 0025. Total pressure at end is 390 mm. Since 1 gas yields 2 gases, P_inf = 2 P0_reactive + P_inert. Initial is 200. Thus, reactive P0 = 190 mm and inert = 10 mm. At P = 342.5 mm: (190 - x) + 2x + 10 = 342.5 => x = 142.5 mm. Undecomposed C2H5Br = 190 - 142.5 = 47.5 mm. Percentage = (47.5 / 190) × 100 = 25%. Therefore, correct answer is 0025.

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