Question

the density of solution containing 40% by mass of Hcl is 1.2 g/ml. calculate the molarity of solution

Answer 1

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Answer 2

Answer : The molarity of solution is 13.15 mole/L

Solution : Given,

40% of HCl by mass means 40 g of HCl in 100 g of solution.

Density of solution = 1.2 g/ml

Formula used : $Density=\frac{mass}{volume}$

Volume of solution = $\frac{100g}{1.2g/ml}=83.33ml$

Formula used : $Molarity=\frac{\text{ given weight}}{\text{ molecular weight}\times volume(L)}$

Molarity = $\frac{40g}{36.5g/mole\times 83.33L}\times 1000=13.15mole/L$

Therefore, the molarity of solution is 13.15 mole/L.