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A sample of nitrosyl bromide (NOBr) decomposes according to the equation 2NOBr(g)⇌2NO(g)+Br2(g) An equilibrium mixture in a 5.00-L vessel at 100 ∘C contains 3.27 g of NOBr, 3.04 g of NO, and 8.10 g of Br2. What is the total pressure exerted by the mixture of gases?