Answer: 15.2 grams
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n= moles of solute
[tex]V_s[/tex] = volume of solution in ml
moles of solute (nickel (II) chloride hexahydrate ) =[tex]\farc{\text{given mass}}{\text {Molar mass}}=\frac{xg}{237.69g/mol}[/tex]
Putting the values , we get
[tex]0.255= \frac{x\times 1000}{237.69\times 250}[/tex]
[tex]x=15.2g[/tex]
Thus 15.2 grams of nickel (II) chloride hexahydrate are required to prepare 250. mL of aqueous solution whose concentration is 0.255 M.
