Question

How many grams of sodium chloride are required to make a 1.0 L solution with a concentration of 3.5 M?

Answer 1

given. molarity ( conc.) = 3.5 M and volume = 1.0 L

as, molarity = no. of moles/ volume

hence, no. of moles = molarity x volume

=3.5 x 1                                                                                                                          =3.5 moles of NaCl

again, as no. of moles =  mass ( in g )/ molecular mass

so, mass = no. of moles x molecular mass                                                                =3.5 x 58.5

=204.75 g