A 0411 G Sample of Powdered Copper Mixed with an Inert,soluble

question 103

Multiple Choice

A 0.411 g sample of powdered copper mixed with an inert,soluble additive was fully consumed by 23.4 mL of 0.602 M nitric acid,producing copper(II) nitrate,water,and nitric oxide (NO) gas.What was the percent copper (by mass) in the sample?
3 Cu + 8 HNO₃ → 3 Cu(NO₃) ₂ + 2 NO + 4 H₂O

• A)81.7%
• B)68.3%
• C)65.3%
• D)56.9%
• E)34.4%

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