Posted by **Narasaq** on Tuesday, June 2, 2009 at 6:31pm.

How many grams does 3.45 moles of FeCl3 weigh? I got 162.2 grams.

- Chemistry -
**bobpursley**, Tuesday, June 2, 2009 at 6:40pm
It is wrong. Please post your calculations and I will find your error.

- Chemistry -
**Narasaq**, Tuesday, June 2, 2009 at 6:47pm
Fe=55.85 Cl=35.45x3=639.2 total: 695.05.

695 moles 1 gram 3.45 mole

x x

1 mole

I actually got a different answer this time, because I did the work differently. Basically I don't know how to do this sort of problem, so I just need a basic rundown on how to do it. Thanks for your help.

- Chemistry -
**bobpursley**, Tuesday, June 2, 2009 at 6:52pm
OK, your totals for the atoms are 55.85+3*35.45=162.2 grams per mole.

You have 3.45 moles, so you multiply the grams/mole by that. It is 559grams.

Practice this here for a few minutes.

http://www.convertunits.com/from/grams/to/moles

Do it for FeCl2, and C6H12O6

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