Question

2.46 g of sodium hydroxide (molar mass = 40) are dissolved in water and the solution is made to 100 cm${}^3$ in a volumetric flask. Calculate the molarity of the solution.

• A. 0.515 M
  
• B. 0.615 M
  
• C. 0.655 M
  
• D. 0.555 M
  

Answer 1

The correct option is B 0.615 M

Given $2.46g$ $NaOH$

moles of $NaOH=\frac{2.46}{40}$

Molarity = $\frac{No.ofmoles}{Volume\left(me\right)}\times 1000$

$=\frac{2.46}{40\times 100}\times 1000\{1c{m}^3=1me\}$

$=0.615M$