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  • 4 years ago

You have 20g of cobalt. How many atoms of cobalt is this?

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  1. anonymous
    • 4 years ago
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    Hi Brent You need to know the molar mass of cobalt ( 58.933 g/mol) Convert 20 g of cobalt to moles Do this by multiplying the given mass by the molar mass 20g x 1mol/58.933 grams =.339 mol Then, to determine the 3 of atoms, use Avogadro's number( 1 mol of any atom has 6.022 x 10^23 atoms) You have .339 mol, so, 0.339 x 6.022 x 10^23= 2.04 x 10^23 ( or 2 x 10^23) if you want to use the correct number of sig figs. Good luck....

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