Chemical formula from compound name

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Imelda Mena 3I
Posts: 51
Joined: Thu Oct 02, 2014 3:00 am

Chemical formula from compound name

Postby Imelda Mena 3I » Wed Nov 07, 2018 11:38 am

Hey so some of the problems from the homework for the Chemical Bonds section asks us to give the chemical formula when we are given the name of a compound. The problems I am referring to are from chapter 3 #25 and 27 (from the 6th edition). I was able to figure out the chemical formula for most of the compounds but had trouble with: indium (III) sulfide and thallium (III) chloride. What does the roman numbers indicate? Can someone give me through the process of figuring out the chemical formula for these please? Thank you!

anishathomas
Posts: 35
Joined: Fri Sep 28, 2018 12:25 am

Re: Chemical formula from compound name

Postby anishathomas » Wed Nov 07, 2018 12:18 pm

When you have Roman numerals it means you’re dealing with transitional metals. You are denoting the charge of that transitional metal.

Tam To 1B
Posts: 72
Joined: Fri Sep 28, 2018 12:25 am

Re: Chemical formula from compound name

Postby Tam To 1B » Thu Nov 08, 2018 2:42 pm

The Roman numerals indicate the charge. For example, this means that Indium has a 3+ charge. We know that sulfur has a 2- charge, so the compound would be made of 2 Indium and 3 Sulfur to cancel out to charges. This results in the chemical formula: In2S3.


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