19) what mass of hcl is contained in 45.0 ml of an aqueous hcl solution that has a density of 1.19 g cm⁻³…

19) what mass of hcl is contained in 45.0 ml of an aqueous hcl solution that has a density of 1.19 g cm⁻³ and contains 37.21% hcl by mass?

19) what mass of hcl is contained in 45.0 ml of an aqueous hcl solution that has a density of 1.19 g cm⁻³ and contains 37.21% hcl by mass?

Answer

Explanation:

Step1: Calculate the mass of the solution

Use the density - volume formula $m = \rho V$. Given $\rho=1.19\ g/cm^3$ and $V = 45.0\ mL=45.0\ cm^3$. $m=\rho V=1.19\ g/cm^3\times45.0\ cm^3 = 53.55\ g$

Step2: Calculate the mass of HCl

Since the solution is 37.21% HCl by mass, we use the formula $m_{HCl}=m\times w$, where $w = 37.21%=0.3721$ and $m$ is the mass of the solution. $m_{HCl}=53.55\ g\times0.3721\approx19.93\ g$

Answer:

$19.93\ g$