Chemistry

How many grams of NaCl are present in 1.5L of a 0.25M NaCl solution?

1. How many mols do you have? That's mols = M x L = ?
Then mols = grams/molar mass. You know molar mass and mols, solve for grams.

posted by DrBob222
2. Mass of NaCl=?
Volume of solution=1.5litres
Molarity of solution=1.25M
To get the mass of NaCl,we need to find the mole.The relationship between molarity,volume and mole is given as: Molarity(M)=mole(n)/volume(v).
Making the unknown,mole, as subject of the formular;n=M X v
n=0.25 X 1.5 =0.375
But mass = molar mass X mole
molar mass of NaCl(23+35.5)=58.5
mole = 0.375
mass =58.5 X 0.375 =21.94g

posted by Atamhen Kester

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