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Quiz 1 Preparation: Naming Simple Compounds

Posted: Sun Oct 11, 2015 11:02 pm
by Rachael_1H
"How many grams of ammonium chloride are needed to have 3.4 * 10^(-4) moles?"

From this question, which is from the second Quiz #1 Self Preparation Quiz, how are we supposed to figure out the formula for ammonium chloride without outside resources?

Are there certain formulas that we are supposed to have memorized?

Re: Quiz 1 Preparation: Naming Simple Compounds

Posted: Sun Oct 11, 2015 11:27 pm
by JuliaPark2H
Hi Rachel,
I think based on the fundamentals assignment that we had to complete over the summer (and in the course reader review of introductory chemistry), it's important (or at least good/useful) to know common polyatomic ions/oxoanions...
Ammonium is NH4+.
There are also sulfate (SO4^2-), Chlorate (CLO3-)...

There's a brief list of the common ones in the course reader or online which would be useful to know by heart.
Knowing that ammonium is NH4+ and Chloride is Cl-, you can figure out that the ionic compound comes out to be NH4Cl.