The molarity of a solution in which 5.3 g Na2CO3 is dissolved in 500 mL will be

Question

The molarity of a solution in which 5.3 g Na2CO3 is dissolved in 500 mL will be (A) 1.0 M (B) 0.1 M (C) 0.20 M (D) 0.2 M

Tardigrade Admin · Accepted Answer

Molecular mass of Na 2 CO 3=106 g mol -1 ∴ Number of moles =(5.3/106)=0.05 mol As 0.05 mol are dissolved in 500 mL; Number of moles dissolved in 1000 mL (1 L ) or molarity of the solution =(0.05/500) × 1000=0.1 M

Q. The molarity of a solution in which $5.3 g N a_{2} C O_{3}$ is dissolved in $500 m L$ will be

$1.0 M$

$0.1 M$

$0.20 M$

$0.2 M$

Molecular mass of $N a_{2} C O_{3} = 106 g m o l^{- 1}$

$∴$ Number of moles $= \frac{5.3}{106} = 0.05 m o l$

As $0.05 m o l$ are dissolved in $500 m L$ ;

Number of moles dissolved in $1000 m L (1 L)$ or molarity of the solution

$= \frac{0.05}{500} \times 1000 = 0.1 M$

Q. The molarity of a solution in which 5.3gNa2​CO3​ is dissolved in 500mL will be

1.0M

0.1M

0.20M

0.2M