Which of the following solutions have the same concentration?

Options

A. 20g of NaOH in 20mL of solution
B. 0.5mol of KCl in 200mL of solution
C. 40g of NaOH in 100mL of solution
D. 20g of KOH in 200mL of solution

Explanation

Molarity `(M)=("weight of NaOH"xx1000)/("Molecular weight of NaOH"xxV(mL))`
`=(20xx1000)/(40xx200)=2.5M`
(b) `M=(0.5xx1000)/(200)=2.5M`
(c)` M=(40xx1000)/(10xx100)=10M`
(d) ` M=(20xx1000)/(56xx200)=1.785M`
Thus, 20 g NaOH in 200mL of solution and 0.5mol of KC l in 200 mL have the same concentration