[tex]CuO + H_2 =^t Cu + H_2O\\3Cu + 8HNO_3 (dilute) = 3Cu(NO_3)_2 + 2NO + 4H_2O\\Cu(NO_3)_2 + 2NaOH = Cu(OH)_2 + 2NaNO_3\\Cu(OH)_2 =^t CuO + H_2O[/tex]
[tex]x_1 = Cu\\x_2 = Cu(NO_3)_2\\x_3 = Cu(OH)_2[/tex]
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[tex]CuO + H_2 =^t Cu + H_2O\\3Cu + 8HNO_3 (dilute) = 3Cu(NO_3)_2 + 2NO + 4H_2O\\Cu(NO_3)_2 + 2NaOH = Cu(OH)_2 + 2NaNO_3\\Cu(OH)_2 =^t CuO + H_2O[/tex]
[tex]x_1 = Cu\\x_2 = Cu(NO_3)_2\\x_3 = Cu(OH)_2[/tex]