A nickel coin is actually made of 75% copper and 25% nickel. A nickel coin weighs 5.0 grams.
a) The atomic mass of copper is 63.546 amu. How many moles and how many atoms of copper are in one nickel coin?
Step 1: Find 75% of 5.0 grams. (0.75)(5.0) = _________________ g of Cu
Step 2: Use the amount to calculate the number of moles.g of Cu * 1 mol C/63.546 g of Cu = ____________ mol Cu
Step 3: Use the number of moles to calculate the number of atoms. g of Cu * 6.022 x 1023atoms Cu/1 mol cu = ____________ atoms of Cu