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2. 0,25 moles of sodium chloride is dissolved in water to form 100 cm solution. Calculate the concentration of the solution. 3. 20 g of sodium hydroxide is dissolved in 200 cm³ of water. Calculate the concentration of the solution. 4 Calculate the mass of magnesium chloride needed to prepare 100 ml of a standard solution of​

Respuesta :

The  concentration of the solution will be 0.25M and the concentration of the  

sodium Hydroxide is 2.5 M .

What is Stoichiometry ?

A branch of chemistry deals with the application of  the laws of definite proportions and of the conservation of mass and energy to chemical activity. The quantitative relationship between constituent in a chemical substance.  

We have given here,

Moles of sodium chloride  =  0.25moles

Let us assume the the volume of  the solution is 1 L.

Molarity = 0.25/

Molarity will be 0.25 M

The mass of sodium Hydroxide is 20g and the molar mass is 40g ,

and the Volume will be 0.2L

Molarity = 20/ 40×0.2

Molarity = 2.5 mol / L

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