What is the #"molar concentration"# of a mass of #21.9*g# mass of #"potassium chloride"# dissolved in #869*mL# of solution?

1 Answer
Feb 3, 2017

Answer:

#"Molarity"# #=# #"Moles of solute"/"Volume of solution"#

Explanation:

And so we just have to plug the given numbers in, knowing that #"potassium chloride"# has a molar mass of #74.55*g*mol^-1#.

#"Molarity"# #=# #((21.9*g)/(74.55*g*mol^-1))/(0.869*L)~=0.3*mol*L^-1#.

Note that #1*mL=10^-3L#; equivalently, #1000*mL-=1.000*L#. What are the concentrations with respect to #K^(+)(aq)# and #Cl^(-)(aq)#?