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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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