Is 2H + O2 →2H2O a balanced chemical equation? Is it obeying the law of conservation of matter?
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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
Second, you have to make an equation an find x ( the copper mass must be added). The answer is: 13,5g pure copper