Calculate the molarity of a solution prepared by dissolving 12.6 g of na2cro4 in enough water to produce a solution with a volume of 630. ml

First we need to calculate the molar mass of :

Na: 22.99g * 2 = 45.98g

Cr: 51.996g

O: 15.999g * 4 = 63.996g

Then add all of them together:



Now we know the molar mass of is 161.97g.

We are given the amount of grams used in the solution. So let's find how many moles that were used:



We are asked to calculate the molarity, and we know the molarity formula is as follows:



We just calculated the number of moles that were used, and we are given the amount of solution (in mL, but we can convert 630 mL to 0.63 L by dividing by 1000 since there are 1000 mL in 1 L). So let's plug in the values to calculate for molarity:



So now we know that the molarity of the solution is 0.12 M.

Is there a diagram/picture you can provide? it seems this question goes along with a

They carry out the exchange of gases as we breathe ( oxygen and carbon dioxide).