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Topic: Sulfur  (Read 6255 times)

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Offline tortoise

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Sulfur
« on: October 17, 2007, 07:21:50 AM »
Sulfur molecules exist under various conditions as S8, S6,
S4, S2, and S.
(a) Is the mass of one mole of each of these molecules the same?
(b) Is the number of molecules in one mole of each of these molecules the same?
(c) Is the mass of sulfur in one mole of each of these molecules the same?
(d) Is the number of atoms of sulfur  in one mole of each of these molecules the same?

(a) the same, = ?
(b) not the same
(c) the same, = 32g ?
(d) not the same

I am not sure about my answers. What is the difference between (a) and (c)?

Please help me.
Thanks in advance.

Offline Sev

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Re: Sulfur
« Reply #1 on: October 17, 2007, 07:54:57 AM »
a) no (eg. a mole of S4 would be twice the mass of a mole of S2)
b) yes.  Each will have Avagadro's number of molecules.
c) atomic mass will remain the same.
d) no.  eg. S4 will contain twice the number of S2

Offline AWK

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Re: Sulfur
« Reply #2 on: October 17, 2007, 08:03:53 AM »
Quote
c) atomic mass will remain the same.
But question do not concern  the atomic mass
AWK

Offline tortoise

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Re: Sulfur
« Reply #3 on: October 17, 2007, 11:09:00 AM »
What about my answer, AWK?

Offline AWK

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Re: Sulfur
« Reply #4 on: October 17, 2007, 11:12:53 AM »
Only your answer for d is correct.
Sev gave correct answers for a and b
AWK

Offline tortoise

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Re: Sulfur
« Reply #5 on: October 17, 2007, 11:23:05 AM »
many thanks! but, you left (c) for me to be crazy with   :'(
Can you give an answer to it?

Thanks.

Offline AWK

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Re: Sulfur
« Reply #6 on: October 17, 2007, 11:31:32 AM »
The answer is evident - just different than yours - mass of sulfur in 1 mole of S6 must be different than in 1 mole of S8
AWK

Offline gonzo

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Re: Sulfur
« Reply #7 on: October 17, 2007, 02:31:07 PM »
It might be easier for you if you remember that a mole is a specific number (Avogadro's number), so in case of c):

- is the mass of a sulfur molecule S2 the same as S4? No, the S4 is twice as big, so the mass is twice as big. So whether we have one of each molecules or 100 of each molecules we know one is twice as large mass as the other. In this case we have a mole of each molecule (a really large amount, 6.022x10^23), but it's the same amount of molecules in each group, so the bigger molecules with the bigger mass still have twice the mass in comparison to the smaller ones.

I remember being really confused about moles when I needed to use them, hopefully I haven't fed you wrong information (please someone correct me if that's the case)!

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