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# Chemistry Question watch

1. How many moles are their in two tonnes of sulphur and 100 kg of calcium hydroxide.
2. What are the concentrations?
3. Well in two tonnes of sulphur, its 2,000,000g, so to get the moles, you divide that by the atomic mass.

Thanks
4. It doesn't say
5. I don't think you will need the concentrations.
6. I thought it was just moles = mass/Mr? - As they're both solids. You only need concn if it's a solution don't you?
7. I;m still stuck. If it was 2,000,000 over 32 n the sanswer would be 125000 moles
what about 100kg of calcium hydroxide
8. 2 tonnes of S = 62,500 moles
9. 2 tonnes = 2000kg = 2,000,000g
Mr of Sulphur = 32
Moles - 2000000/32 = 62500 moles (where did you get 125000 from?)
But yeh, that should be right. You would think in a large mass, there would be a lot of moles.
Just do the same working for the calcium hydroxide, except you have to work out the mr.
10. (Original post by karate_kat)
2 tonnes = 2000kg = 2,000,000g
Mr of Sulphur (s) = 16 (where did you get s2 from?)
Moles - 2000000/32 = 125000 moles
But yeh, that should be right. You would think in a large mass, there would be a lot of moles.
Just do the same working for the calcium hydroxide, except you have to work out the mr.
the Ar of sulfur is 32
11. so which is it 125,000 or 62,500
12. yeh, just changed that, sorry
13. Same idea with Ca(OH)2 its Mr is 74 gmol-1

This is where you want to post chemistry questions:

http://www.thestudentroom.co.uk/forumdisplay.php?f=130
14. So it's 1351 Mol. Am i right
15. Yep

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