Question

Nitric acid and nitrogen monoxide react to form nitrogen dioxide and water, like this: 2HNO3 (aq) + NO (g) → 3NO2 (g) + H2O (l)

At a certain temperature, a chemist finds that a 9.5L reaction vessel containing a mixture of nitric acid, nitrogen monoxide, nitrogen dioxide, and water at equilibrium has the following composition:

compound amount

HNO3 15.5g

NO 16.6g

NO2 22.5g

H2O 189.0g

Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits.