Question

Chemistry Question!! Please help, I'm stupid...

Calculate the molarity of a saline solution prepared by dissolving 19.3 g of sodium chloride in 250 mL of water.

Please show all work!!!

Answer 1

First, let's calculate the concentration by gram per liter:
C =
`(19.3)/(0.25)` = 77.2 g/L

Now, let's convert it to molarity, knowing that the molar mass of sodium chloride is 58.5g/mol:
Molarity =
`(77.2)/(58.5)` = 1.31 M

For more explanation:
molarity =
`(gram)/(Liter)` *
`(Mol)/(gram)` =
`(mol)/(Liter)`