Calculate the molarity of 1 mole of NaNO3 in 500 mL of water

Question

Help for my chemistry, question in title, thanks

Answer 1

The molarity of a solution is defined as follows:

 

M = moles of solute

    -------------------

    volume of solution in Liters

 

So, first we need to know the number of moles of solute, which is the species being dissolved. In this case, we know it is 1 mole of NaNO3 because it's given in the problem.

 

Next, we need to know the volume of solution in liters.  We are told there are 500 mL of water.  There are 1,000 L in 1 mL:

 

500 mL ( 1 L / 1,000 mL) = 0.500 L 

 

Now, solve for molarity:

 

      1 mole NaNO3

M = ----------------   =    2.00 mol/L   or   2.00 M.

        0.500 L