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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!!!
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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!!!

User Bence Kaulics
by
6.3k points

1 Answer

4 votes
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)
User Budius
by
6.6k points
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