Question

Determine the number of moles of NaCl in the solution.
Measured Mass of NaCl: 11.69g
Measured Vol of Water: 100mL
Molar Mass of NaCL: 58.44g/mol

11.69gNaCL/58.44g/mol = 0.20 mol NaCl

Do I then to multiply my answer by 100ml?
0.20 x 100=20.00mol NaCl?

Answer 1

No. You were asked for mols. That's mols = grams/molar mass and that's what you have done. Placing it in water has nothing to do with the number of mols. For example, suppose you have a pound of bananas and each banana weighs 1/4 pound. That means you must have four bananas in that bunch. Placing them in a bucket of water doesn't change the number of bananas. There are four of them in or out of the water.