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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: duduhead on July 21, 2009, 01:55:48 PM

Title: Chemistry 1010
Post by: duduhead on July 21, 2009, 01:55:48 PM: How many grams of SO2 are produced when 330 grams of H2S reacts with oxygen?
2 H2s+ 3 O2 arrow 2 So2 + 2 H20

This question is on my homework and the equation is suppose to help me in solving it but I have no idea how to do it! :(

Thanks so much for the *delete me*
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 02:20:16 PM: How many moles is 330g of H₂S?
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 02:24:36 PM: Quote from: sjb on July 21, 2009, 02:20:16 PM
How many moles is 330g of H₂S?
is it 3?
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 02:26:03 PM: Quote from: duduhead on July 21, 2009, 02:24:36 PM
Quote from: sjb on July 21, 2009, 02:20:16 PM
How many moles is 330g of H₂S?
is it 3?

No, it isn't. What is the molecular weight of H₂S?
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 02:27:10 PM: 34
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 02:28:08 PM: Quote from: duduhead on July 21, 2009, 02:27:10 PM
34

So how many moles are there in 330g?
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 02:31:05 PM: is it 330?
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 02:33:39 PM: Quote from: duduhead on July 21, 2009, 02:31:05 PM
is it 330?

Not 330 either. Perhaps another way to look at it - if an egg weighs 34g, how many eggs do you need to weigh 330g?
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 02:36:00 PM: 9.7?
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 02:40:45 PM: Quote from: duduhead on July 21, 2009, 02:36:00 PM
9.7?

So how many moles of H₂S are there in 330g?

edit hit sup instead of sub :(
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 02:45:04 PM: is it 9.7?
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 02:46:33 PM: Quote from: duduhead on July 21, 2009, 02:45:04 PM
is it 9.7?

Great! Now, from your equation, how many moles of SO₂ are generated when you react 9.7 mol of H₂S?
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 02:51:36 PM: 330?
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 02:54:57 PM: Quote from: duduhead on July 21, 2009, 02:51:36 PM
330?

No, not 330. If you had 2 moles of H₂S, how many moles of SO₂ could you produce?
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 03:06:28 PM: I really don't know! I'm stumped.
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 03:17:01 PM: From your balanced equation;

2 H₂S + 3 O₂ :rarrow: 2 SO₂ + 2 H₂O

for every molecule (and hence mole) of H₂S you put in, given excess oxygen, you form one molecule of SO₂. So, if you have 9.7 mol of H₂S, how many moles of SO₂ can you form?
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 03:23:01 PM: 9.7?
Title: Re: Chemistry 1010
Post by: sjb on July 21, 2009, 03:25:44 PM: Quote from: duduhead on July 21, 2009, 03:23:01 PM
9.7?

Right, so what is the molecular mass of SO₂, and given that, and the number of moles, what mass of SO₂ can you produce?
Title: Re: Chemistry 1010
Post by: duduhead on July 21, 2009, 03:28:29 PM: 64?
Title: Re: Chemistry 1010
Post by: sjb on July 22, 2009, 01:56:19 AM: 64 g mol^-1 is the molecular weight, yes, so how much SO₂ can you produce?
Title: Re: Chemistry 1010
Post by: duduhead on July 22, 2009, 02:26:05 PM: is it 1 gram?
Title: Re: Chemistry 1010
Post by: sjb on July 22, 2009, 02:42:05 PM: Quote from: duduhead on July 22, 2009, 02:26:05 PM
is it 1 gram?

No. If 1 egg weighs 64g, how many grams does 9.7 eggs weigh?

Not being horrible or anything, but how much maths / chemistry have you done - these sort of problems are reasonably straightforward and, arguably to me, well below undergraduate level.

S
Title: Re: Chemistry 1010
Post by: duduhead on July 22, 2009, 03:05:15 PM: I am taking an online chemistry course, and I am having trouble with these sorts of problems in general. I can't find any examples anywhere. I wish I knew the method for doing them though.
Title: Re: Chemistry 1010
Post by: nj_bartel on July 22, 2009, 05:14:14 PM: http://chemistry.alanearhart.org/Tutorials/DimAnal/
Title: Re: Chemistry 1010
Post by: duduhead on July 23, 2009, 02:22:44 PM: what are these types of problems called?
Title: Re: Chemistry 1010
Post by: nj_bartel on July 23, 2009, 06:09:24 PM: Quote from: nj_bartel on July 22, 2009, 05:14:14 PM
http://chemistry.alanearhart.org/Tutorials/DimAnal/

dimensional analysis