Question

Commercially available concentrated HCl contains 38 % HCl by mass and has density
1.19 g/cm3.
Calculate the molarity of this solution.​

Answer 1

38 % HCl by mass means 38g of hcl in 100g of solution

density of solution=1.19 g/cm³

$density = \frac{mass}{volume} \\ mass = 1.19 \times 1000 =1190g$

$\%mass \: of hcl = \frac{38 \times 1190}{100} = 452.2 \\ moles \: of \: hcl \: = \frac{36.5 }{452.2} = 12.38$

$molarity = \frac{moles \: of \: hcl}{vol.solution} \\ molarity = \frac{12.38}{1litre} = 12.38$

I hope this helps ( ╹▽╹ )