Answer:
luyxwfuowdqulgwqofugvwfwgvoueugbvfebfvebh
Explanation:
7 is atomic symbol 9 is atomic density 8 is the atomic number
First, you need to count copper mass in alloy.
Second, you have to make an equation an find x ( the copper mass must be added). The answer is: 13,5g pure copper
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