Question

How many grams of NaCl must be dissolved in 3500 mL of water to make 0.25 M solution

Answer 1

Molarity=Number of moles / volume of solution (in L)

Number of moles =Molarity*Volume of solution(in L)

$=0.25*3.5$

$=0.875mol$

Molecular weight of $NaCl=58.5gms.$

Weight required$=0.875*58.5$

$=51.275gms.$