Sea water,which can be considered as a 6 M s | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Sea water is $6 \ M$ in $NaCl$,so $1000 \ mL$ of sea water contains $6 \ mol$ of $NaCl$.$	ext{Mass of solution} = 	ext{Volume} 	imes 	ext{dens

Vedclass · Accepted Answer

$2$

Vedclass · Answer

(A) Sea water is $6 \ M$ in $NaCl$,so $1000 \ mL$ of sea water contains $6 \ mol$ of $NaCl$.$	ext{Mass of solution} = 	ext{Volume} 	imes 	ext{density} = 1000 	imes 2 = 2000 \ g$.$	ext{ppm} = \frac{	ext{mass of } O_2}{	ext{mass of solution}} 	imes 10^6$.$5.8 = \frac{	ext{mass of } O_2}{2000} 	imes 10^6$ $\Rightarrow 	ext{mass of } O_2 = 5.8 	imes 2 	imes 10^{-3} = 1.16 	imes 10^{-2} \ g$.$	ext{Molality of } O_2 = \frac{	ext{moles of } O_2}{	ext{mass of solvent in } kg}$.$	ext{Mass of solvent} = 	ext{Mass of solution} - 	ext{Mass of } NaCl = 2000 - (6 	imes 58.5) = 2000 - 351 = 1649 \ g = 1.649 \ kg$.$	ext{Moles of } O_2 = \frac{1.16 	imes 10^{-2}}{32} = 0.03625 	imes 10^{-2} = 3.625 	imes 10^{-4} \ mol$.$	ext{Molality} = \frac{3.625 	imes 10^{-4}}{1.649} \approx 2.197 	imes 10^{-4} \ m$.Thus,$x \approx 2$.

Similar Questions

If a solution is $98\% \ H_2SO_4$ by weight and has a density of $1.8 \ g/mL$,its molarity is ....... $M$.

$A$ solution of sodium sulphate contains $92 \ g$ of $Na^{+}$ ions per kilogram of water. The molality of $Na^{+}$ ions in that solution in $mol \ kg^{-1}$ is:

What are the mole fraction of water and the total number of moles in a solution formed by dissolving $1$ mole of urea in $1000 \ g$ of pure water,respectively?

The solutions $A$ and $B$ are $0.1 \ M$ and $0.2 \ M$ in a substance. If $100 \ mL$ of $A$ are mixed with $25 \ mL$ of $B$ and there is no change in volume,then the final molarity of the solution is ......... $M$.

In a water sample,the concentration of $F^-$ ions is $10 \ ppm$ by weight-volume. What is the concentration of $F^-$ in $\% W/V$ in that solution?

Vedclass Test Series

Exam Paper Generator

Online Exam Module