carong46 Posts: 1, Reputation: 1 New Member #1 Mar 8, 2009, 11:21 AM
How many Moles
A sample containing 0.187g Cl- is dissolved in 50.0 mL water.

How many moles of Cl- ion are in the solution? (How do I calculate this?)

What is the Molarity of the Cl-iion in the solution? (MCL- = nCl-/Vsoln) (How do I calculate this?

Thanks!
C GIbson
 Perito Posts: 3,139, Reputation: 150 Ultra Member #2 Mar 8, 2009, 12:49 PM

0.187 g of Cl-?

Cl has an atomic weight of 35.453

The units of molecular weight are g/mole. Divide "grams" by "grams/mole" and you end up with moles (just like x divided by x/y yields y).

Molarity = moles per liter "per" implies divide. So you divide the number of moles by the number of liters.

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