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**2.95 mol Ba(OH)4 to atoms.**(I think I wrote this problem wrong. It might be (OH)2 instead).

I'm confused >.< Do I:

1) multiply 2.95 mol by 6.02 x 10^23 atoms or

or

2) multiply 2.95 mol x 6.02 x 10^23 molcules x 9 atoms.

or is it something else?

Also, how do I do these?

Calculate the mass of 3.01 x 10^23 formula units (ions) of Strontium hydroxide.

Find the number of atoms in 16.0g of sulfur

Please help if you can. ~____~

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