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OpenStudy (anonymous):
A .411g sample of powder copper mixed with an inert, soluble additive was fully consumed by 23.4 mL of .602M nitric acid, producing copper (II) nitrate, water and nitric oxide (NO) gas. What was the percent copper by mass in the sample? 3Cu + 8HNO3 ---> 3 Cu(NO3) + 2NO + 4 H2O
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