Chem how many grams do 1.3 x 10^21 atoms of sodium weigh? ?

So first we must find how many moles this amount of atoms is. We know that Avogadro's number is the amount of atoms per mole:

So then we look to the periodic table to find the molar weight of sodium (Na).

Sodium's molar weight is 22.99g/mol. So let's solve for the amount of grams:

So now we know that the given amount of atoms weighs .

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