[Tizzy]

http://answers.yahoo.com/question/index?qid=20100326185754AAAsbje&r=w&show_comments=true&pa=FZB6NWHjDG3N56z6v_2xWGIO0QUSkN5.EShymrrgOl4TEI0KRC65kg--&paid=add_comment#openions

On #4, he uses 14g instead of 24g. I just want to make sure this was incorrect and corrected in my comment below the resolved question.

Thanks!

*Edit* not sure if I'm allowed to post links, so I'll just C&P the whole thing here.

How many moles of sulfur are in 24g of (C3H5)2 S?


1) How many moles of sulfur are in 24g of (C3H5)2 S

2) How many hydrogen atoms are in 0.73 mole (C3H5)2 S

3) How many grams of carbon are in 4.22×10^23 molecules (C3H5)2 S

4) How many carbon atoms are in 14.0g (C3H5)2 S

Reply:

moles (C3H5)2S = 24 g /114.212 g/mol=0.21

1) moles S = 0.21

2)
1 : 10 = 0.73 : x
x = moles H = 7.3
hydrogen atoms = 7.3 x 6.02 x10^23=4.4 x 10^24

3)
moles = 4.22 x 10^23 / 6.02 x 10^23=0.701
moles C = 3 x 2 x 0.701=4.21
mass C = 4.12 x 12.011=50.5 g

4)
moles = 14.0/114.212 = 0.123
moles C = 0.123 x 2 x 3 = 0.735
atoms = 0.735 x 6.02 x 10^23=4.43 x 10^23

My reply:

Part 4) is incorrect. It should read:

Moles= 24.0/114.212 = 0.210
Moles C = 0.210 x 2 x 3 = 1.261
Atoms = 1.261 x (6.02 x 10^23)= 7.59 x 10^23

[iamback]

^^^^Incorrect. He solved it correct for sure.

Why are you changing it to 24 from 14 when the question is 4) How many carbon atoms are in 14.0g (C3H5)2S ?

[Tizzy]

You're right, thank you.

You can delete this post if you want

[iamback]

^^^It's okay.

Well I can't delete this post, and I think no one can, not sure about the moderators.

[billnotgatez]

From the forum rules

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