Alright so you know the number of molecules
5.610^22
but also know this formula:
#moles= #of molecules / (6.0210^23)
#moles= (5.610^22) / (6.0210^23)
#moles= 0.093023255
#moles= mass/ molar mass of NaCl
therefore #molesmolar mass of NaCl= mass
0.093023255 58.44 = 5.43 g of NaCl
