Homework Help: Chemistry

Posted by Lindt on Monday, March 18, 2013 at 3:20pm.

How many chlorine atoms are contained in a 1.00 g sample of iron(III) chloride, FeCl3? Use the masses to two decimal places from the chart in the front of your text. Use the format 6.02E23 for 6.02 x 1023, or 6.02E-23 for 6.02 x 10-23,use two decimal places in your answer.

Chemistry - DrBob222, Monday, March 18, 2013 at 3:29pm
mols FeCl3 = 1.00g/molar mass.
mols Cl atoms = 3 times that.
Then mol Cl x 6.02E23 = ?
Chemistry - Lindt, Monday, March 18, 2013 at 3:34pm
So I need to multiply 6.02E23 by 3?
Chemistry - DrBob222, Monday, March 18, 2013 at 3:39pm
No. That's the third step. (Read my answer again. It isn't that garbled.)
Step 1. mol FeCl3 = grams/molar mass
Step 2. mols Cl = 3 x step 1
Step 3. Step 2 x 6.02E23.

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