## Homework problem 3.25

Tara 1F
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### Homework problem 3.25

I'm confused on the steps on how to solve this problem. Can someone show me how they solved it or give tips!

Chem_Mod
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### Re: Homework problem 3.25

Do you mind providing a picture of the problem or replicating it below?

Timothy Kao 1B
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### Re: Homework problem 3.25

Chem_Mod wrote:Do you mind providing a picture of the problem or replicating it below?

On the basis of the expected charges on the monatomic ions, give the chemical formula of each of the following compounds: (a) magnesium arsenide; (b) indium(III) sulfide; (c) aluminum hydride; (d) hydrogen telluride; (e) bismuth(III) fluoride.

Timothy Kao 1B
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### Re: Homework problem 3.25

3.27 is also a similar type of problem.

On the basis of the expected charges of the monatomic ions, give the chemical formula of each of the following compounds: (a) thallium(III) chloride; (b) aluminum sulfide; (c) manganese(IV) oxide.

Chem_Mod
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### Re: Homework problem 3.25

Using thallium(III) chloride as an example.
The total charge is zero. Therefore total cation charge must equal total anion charge.
Since the thallium is +3 and chloride is -1, there must be three chloride anions which gives the answer:
TlCl3

Timothy Kao 1B
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Joined: Fri Jun 23, 2017 11:39 am

### Re: Homework problem 3.25

I found this video that I thought was helpful. Hope it helps!

604807557
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### Re: Homework problem 3.25

For part b of problem 3.25, the answer is In2S3 but for In I got +3 and for S I got +6. How do you get In2S3? Same for part d; the answer is H2Te but for H I got +1 and for Te I got +6, the answer is H2Te not H6Te.