What is the molarity of a solution that contains "5 moles"5 moles of solute dissolved in a solution that is "975 mL"975 mL?

1 Answer
Meave60
May 5, 2017

The molarity of the solution is "5.1 mol/L"5.1 mol/L.

The solution is said to be "5.1 molar"5.1 molar.

The shorthand way to indicate molarity is "5.1 M"5.1 M, which is pronounced "5.1 molar"5.1 molar, and is how it is written on the label of its container.

Explanation:

"Molarity (M)"=("moles of solute")/("liters of solution")Molarity (M)=moles of soluteliters of solution

The volume of the solution is given in mL. The volume is required to be in liters, so "975 mL"975 mL must be converted to liters.

"1 L=1000 mL"1 L=1000 mL

975color(red)cancel(color(black)("mL"))xx(1"L")/(1000color(red)cancel(color(black)("mL")))="0.975 L"

"Molarity (M)"=(5.0"mol")/(0.975"L")="5.1 mol/L" rounded to two significant figures

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