Since there are 63.01284 grams to one mole of HNO3, then 12.5 moles would be in 450 grams of it.
The moles of any substance are equal to the substance's mass divided by its molar mass. Therefore, in order to calculate the moles of copper, you would divide the reacted mass by 63.55
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After looking at answers I agree with the statement Chemistry is fun.
