What is the molarity of a solution made by dissolving 4.88 g of KCl in 423 mL of solution?

chemistry molarity

2 Answers
Sarita Rana
Feb 19, 2018

Molarity = #0.154##M#

Explanation:

mass of #KCl# = #4.88##g#
molar mass of #KCl# = #74.55# #g#/#mol#
no. of moles = #4.88#g/#74.55# #g#/#mol# = #0.0654# moles
volume of solution = #423 ml# = #0.423L#
Molarity = no. of moles/volume of solution
Molarity = #0.0654# moles/#0.423L#
Molarity = #0.154##M#

anor277
Feb 19, 2018

We take the quotient...#"molarity"="moles of solute"/"volume of solution"#

Explanation:

Here........... #"Molarity"=(underbrace((4.88*g)/(74.55*g*mol^-1))_"moles of solute")/underbrace(423*mLxx10^-3L*mL^-1)_"volume of solution"=0.155*mol*L^-1#

And note that the quotient automatically gives the units required for #"concentration".#

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