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Topic: Figuring out # of units?  (Read 2125 times)

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Offline unstable

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Figuring out # of units?
« on: February 27, 2018, 10:47:12 PM »
I'm not quite sure how to ask my question without taking a screenshot but I'll try. It says:

Find the number of: SO42- Units, #S atoms, #O atoms, #Metal atoms    for:

CaSO4
Al2(SO4)3
K2SO4

Im not looking for the answer(s) as much as how to figure it out. Ive looked at my text, Introductory Chemistry, Fifth Edition by Nivaldo J. Tro. Its an online book through Pearson.
« Last Edit: February 27, 2018, 11:00:21 PM by unstable »
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Offline unstable

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Re: Figuring out # of units?
« Reply #1 on: February 27, 2018, 10:59:31 PM »
Ok, so I got it figured out but Im still a little confused. For CaSO4, it was 1 unit, 1 sulfur, 4 oxygen, 1 metal. Im confused why it would say " Find the number of SO42- Units". The 2- was throwing me off and I was thinking that I had to either multiply or divide, which I didnt.

I guess Im asking if someone can explain it in the most basic way possible.  :-\
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Offline Borek

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Re: Figuring out # of units?
« Reply #2 on: February 28, 2018, 02:53:00 AM »
Do you know what these numbers (2-) mean?
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Offline jestearns

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Re: Figuring out # of units?
« Reply #3 on: March 16, 2018, 01:03:49 AM »
If "units" is replaced with "ions", does the problem make more sense?
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