Question

3. What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per
500 ml?
(a) 4 moll
(6) 20 mol L
(c) 0,005 M
(d) 0.5 M​

Answer 1

Explanation:

Molarity, M= number of moles/volume of solution

M=

V

n

Number of moles, n= mass/molar mass

Molar mass of NaCl=58.5 g/mol

Mass = 5.85g

n=5.85/58.5=0.1 mol

Volume, V=500 mL=0.5 L

∴M=0.1/0.5=0.2mol/L

Hence, option C is correct.