Homework Help: Chem

Posted by Chris on Tuesday, October 19, 2010 at 12:02pm.

Could you please tell me if these are right?
How many moles are in the following.
A.) 80.0 g of NaOH I got 2.0 moles.

B.) 12.0 g of Ca(OH)2 I got 0.16 moles.

Write the simplest formula for each of the following compounds.

A.) 0.200 mole Al and 0.600 Cl. I got AlCl3

B.) 0.080 mole Ba, 0.080 mole S, 0.320 mole O. I got BaSO4

Chem - DrBob222, Tuesday, October 19, 2010 at 1:40pm
You threw away two perfectly good numbers for the first two.
80.0/39.997 = 2.000 which rounds to 2.00 to three significant figures (you are allowed 3 from the 80.0).

12.0/74.093 = 0.16196 which rounds to 0.162 to three s.f. (3 s.f. allowed by the 12.0)
The other two are ok.

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