# Question #ec0b6

##### 2 Answers

Calculation of Molarity

For proper definition of Molarity and other relationships refer

here .

Molarity is defined as the number of moles of solute per unit volume of the solution.

We need

That means there has to 2 moles of solute in a litre of solution. For 250 ml it is 0.5 moles. If you know the Molecular weight of

**Given**

Required number of moles

Molecular weight of

So the weight of required

Here's how you'd go about solving this problem.

You know that you must have a

If you find out how many moles of solute you need, you can determine the mass in grams by using sodium chloride's molar mass, which represents how much 1 mole of

(notice I've converted mL to L, sicne molarity is defined as moles per liter)

This means that you need

Now to determine the mass in grams

As a conclusion, if you dissolve