Answers
molarity can be defined as = (no. of moles of solute)/(solution in liters)
here you need to know in what volume you want to prepare the solution
soppose you want to prepare a 2.0M in 1L
2=m/1L where m is no. of moles of solute
which when solved m=2moles
as 1mole NaCl = 58.44 g 2 moles will be 2*58.44g = 116.88g
it means if you want to prepare 2M solution in 1L you need 116.88g NaCl
let us suppose you want to prepare 2M solution in 0.5L
now
2=m/0.5L m=1mole
ie 58.44g
so if you want to prepare 0.5L 2molar solution you need 58.44g of NaCl
molarity of solution prepared by 3mole NaI in 6L =3/6=0.5M
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