Answer: The molarity of solution will be 0.00325 M
Explanation:
Molarity : It is defined as the number of moles of solute present per liter of the solution.
Formula used :
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n= moles of solute =[tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
given mass = 239 mg = 0.239 g (1g=1000mg)
moles of [tex]K_2Cr_2O_7=\frac{0.239g}{294.19g/mol}=8.12\times 10^{-4}mol[/tex]
[tex]{V_s}[/tex] = volume of solution in ml = 250 ml
Now put all the given values in the formula of molarity, we get
[tex]Molarity=\frac{8.12\times 10^{-4}\times 1000}{250ml}=3.25\times 10^{-3}mole/L[/tex]
Therefore, the molarity of solution will be 0.00325 M
