Question
Asked Oct 16, 2019

What is the molarity (M) of a 250mL aqueous solution of 4.50 grams sodium hydroxide?

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Step 1

Number of moles for a given chemical species are defined as the ratio of mass to the molar mass. The mathematical formula which is used to calculate the number of moles is shown below:

Mass
Number of moles=.
Molar mass
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Mass Number of moles=. Molar mass

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Step 2

The molarity of a solution refers to the ratio of number of moles to the volume of the solution. Its SI units are moles/L. It is denoted by the symbol ‘M’. The formula is as shown below:

Number of moles
Molarity
Volume (in L)
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Number of moles Molarity Volume (in L)

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Step 3

The volume of the solution is given to be 250 mL= 0.25 L.

The mass of sodium hydroxide is given to be 4.50 g.

The molar mass ...

Mass
Number of moles-
Molar mass
4.50g
40 g/mol
0.1125 mol
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Mass Number of moles- Molar mass 4.50g 40 g/mol 0.1125 mol

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