Choose the most efficient and accurate way to prepare a sample containing 0.75 moles of iron (fe) atoms. group the iron atoms in bundles of 1000 atoms so they can be counted faster. take a bar of iron that contains one mole of atoms, measure the length carefully, and remove 1/4 of the bar's length. weigh 41.89 grams of iron. count 4.5 ✕ 1023 fe atoms.
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