Question

Concentrated HCl has a density of 1.3g/cc(85% by mass).calculate its molarity.

Answer 1

hydrogen chloride ok bye

Answer 2

Answer : The molarity of solution is 30.29 mole/L

Solution : Given,

85 g of  $HCl$ is present in 100 g of solution.

Molar mass of $HCl$ = 36.5 g/mole

${\text {Moles of solute}}=\frac{\text{Given mass}}{\text{Molar mass}}$    

${\text {Moles of solute}}=\frac{85g}{36.5g/mol}=2.33moles$    

Now we have to calculate the volume of solution.

$Volume=\frac{Mass}{Density}=\frac{100g}{1.3g/ml}=76.92ml$  

Molarity : It is defined as the number of moles of solute present in one liter of solution.

Formula used :

$Molarity=\frac{n\times 1000}{V_s}$

where,

n = moles of solute $HCl$ = 2.33 moles

$V_s$ = volume of solution in ml

Now put all the given values in the formula of molarity, we get

$Molarity=\frac{2.33moles\times 1000}{76.92ml}=30.29mole/L$

Therefore, the molarity of solution is 30.29 mole/L