J.R. S. answered • 12/17/20
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Needed information:
64.2 g Ba(NO3)2
molar mass Ba(NO3)2 = 261 g/mol
Avogadro's number = 6.02x1023 molecules/mole = formula units/mole (I'll use molecules to save space even though for a salt like Ba(NO3)2 we should use formula units)
Use dimensional analysis:
64.2 g Ba(NO3)2 x 1 mol Ba(NO3)2 / 261 g x 6.02x1023 molecules / mole = 1.48x1023molecules Ba(NO3)2
