Copper reacts with dilute nitric acid: $\mathrm{Cu}+\mathrm{HNO}{}_3\to \mathrm{Cu}(\mathrm{NO}{}_3){}_2+\mathrm{NO}+\mathrm{H}{}_2\mathrm{O}$. In the balanced equation (smallest whole numbers) the coefficient of $\mathrm{HNO}{}_3$ is

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