How many formula units of nano3 are in 2.99 moles of nano3 (mw. 85.00 g/mol)?

The   formula   units of NaNO3 that  are  in 2.99  moles  of NaNO3  is  

 1.80 x 10^24  formula units

calculation

Use  the  Avogadro's  constant to  calculate the formula  units

 that is,    1 mole =  6.02 x10^23  formula units

                2.99 moles =?  formula units

by  cross  multiplication

=  (2.99  moles  x 6.02 x10^23  formula units)  /  1 mole  =  1.80 x 10^24   formula units

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