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Problem

A sample of nitrosyl bromide (NOBr) decomposes according
to the equation
2 NOBr1g2 Δ 2 NO1g2 + Br21g2
An equilibrium mixture in a 5.00-L vessel at 100 C contains
3.22 g of NOBr, 3.08 g of NO, and 4.19 g of Br2.
(c) What was the mass of the original
sample of NOBr?