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What is the mass of 2.19 x 10^22 molecules of NaF

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In order to answer this question we will use again the Avogadro's number, but now we are going to find out how many moles we have in 2.19*10^22 molecules of NaF

1 mol = 6.02*10^23 molecules

x moles = 2.19*10^22 molecules

x = 0.04 moles of NaF

Now that we have the number of moles, to find the mass we will need the molar mass of NaF, which is 42 g/mol, this means that for every mol of NaF, we will have 42 grams of it

42 g = 1 mol

x grams = 0.04 moles

x = 1.68 grams of Sodium fluoride, NaF

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