High School

The mass of sodium is 23.0, and the mass of chlorine is 35.5. If the 300 ml of solution contains 25 grams of NaCl, what is the molarity?

Answer :

Molarity is defined as the total number of moles of solute dissolved in 1 litre of solution.

The formula of Molarity is =

Molarity = Number of Moles of solute / volume of solution (in L)

Number of moles = Mass / Molar mass

Given,

Mass of NaCl = 25 gm

Molar mass of NaCl= 23 + 35.5

= 58.5

So, Number of moles= 25/ 58.5

= 0.427

Molarity = 0.427/ 0.3 (in Litres)

= 1.42 mol/ L

Hence, molarity of the given solution is 1.42 mol/ L.

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Molarity of solution is 1.43 mol/L

The total number of moles of solute dissolved in 1 liter of solution is known as molarity.

The volume of solution divided by the number of moles of solute is known as molarity (volume should be in L)

A measure of the concentration of a chemical species is called molar concentration (also known as molarity, quantity concentration, or substance concentration).

Mass divided by Molar mass = number of moles

Given,

NaCl weight is 25 gram.

NaCl has a molar mass of 23 + 35.5.

= 58.5

Therefore, number of moles = 25 / 58.5

= 0.43

Molarity = 0.43 / 0.3 (in Liter)

= 1.43 mol/ L

As a result, the supplied solution has a molarity of 1.43 mol/L.

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