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A piece of copper weighs 0.635 g. How ma...

A piece of copper weighs 0.635 g. How many atoms of copper does it contain?

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Gram atomic mass of copper = 63.5 g Number of moles in 0.635 g of copper `=0.635/63.5 = 0.01` moles
Number of copper atoms in one mole = `6.022 xx 10^(23)`
Number of copper atoms in 0.01 moles
`=0.01 xx 6.022 xx 10^(23) = 6.022 xx 10^(21)`
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