how many copper atoms are in 0.55g of copper?please someone help=(
Copper (Cu) has an atomic mass of 63.546 amu. That means 63.546 g/mol. You can find this information on a Periodic Table. You can convert grams into moles with this information. 0.55g / 63.546 g/mol = 0.0087 mol There are 0.0087 moles of copper atoms in 0.55 grams. You can further convert this into a number by multiplying by 6.02*10^23.
