Question

5. What is the molarity of 4g of NaOH in 2000g of water?
(a) 0.005
(b) 0.0005
(c) 5.0
(d) 0.05​

Answer 1

The molecular weight of NaOH is 40 g/mol. The number of moles of NaOH 40 g/mol5 g=0.125 moles. 5 00 ml water corresponds to0.500 L. The molarity of the ...

Answer 2

Molarity(M) = w × 1000 / GMW × V

where,  

w = given weight of the solute = 4g

GMW = Gram Molecular Weight of the solute = 40g

V = Volume of the solution in ml. = 2000 g

So,  

M of NaOH  

= 4 × 1000 / 40 × 2000

=   4000 / 80000

=  0.05