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39. How many moles are in 50.0 grams of copper? 40. Calculate the average atomic mass of copper. There are two stable isotopes, Cu-63 has

39. How many moles are in 50.0 grams of copper? 40. Calculate the average atomic mass of copper. There are two stable isotopes, Cu-63 has a mass of 62.93 amu and a relative abundance of 69.15%. Cu-65 has a mass of 64.93amu

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