Question

A solution of HCl is 0.300M determine what mass of acid has been dissolved in 150 mL of solution

Answer 1

Number of Moles=Concentration(mol/dm^3)*Volume(dm^3)
Change 150 ml unit into dm^3 by dividing by 1000
150/1000*0.300=0.045 moles
Number of Moles=Mass(g)/Molar Mass(g/mol)
Use your periodic table to find each element's atomic weight of HCL
H:1 Cl:35.5
Molar Mass:(35.5*1)+(1*1)=36.5 grams
Arrange Number of Moles=Mass(g)/Molar Mass(g/mol) to
Number of Moles*Molar Mass(g/mol)=Mass(g)
36.5*0.045=1.6425 grams