Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Helium:
--- Quote from: CatAly$t on June 06, 2010, 03:04:39 pm ---what the hell r u talking abt??
--- End quote ---
Here, check this example.When iron reacts with sulphur the equation is
Fe + S --> FeS
This indicates that we need equal numbers of atoms iron and sulphur to react.
It is known that 1 mol of iron (56g) and 1 mol of sulphur (32g) contain the same number of atoms.
So reacting these amounts should give 1 mole of iron(ll)sulphide (88g). look at equation
Fe + S ---> FeS
1mol 1mol 1mol
56g 32g 88g
they can be scaled down, however they mmust always be ratio 56:32
thus
Fe + S ---> FeS
5.6g 3.2g 8.8
If we tried to 5g of S with 5,6 of iron the excess sulphur would remain unreacted
only 3.2g of sulphur will react. Sulphur is excess omm...
;) most important thing is that the reaction does not require a catalyst :P
saleemsamer:
NOV 09 p3 q4c and 5b PLZ AND Thank You IN ADVANCE :)
WARRIOR:
--- Quote from: saleemsamer on June 06, 2010, 03:22:38 pm ---NOV 09 p3 q4c and 5b PLZ AND Thank You IN ADVANCE :)
--- End quote ---
both asnwrs have been discussed befre , if u go back a few pages ull find them!
Helium:
--- Quote from: saleemsamer on June 06, 2010, 03:22:38 pm ---NOV 09 p3 q4c and 5b PLZ AND Thank You IN ADVANCE :)
--- End quote ---
They have been solved by vin
here they are https://studentforums.biz/index.php/topic,1411.2820.html
In this past paper there are 4 drawing questions ;)
Helium:
--- Quote from: Kimo Jesus on June 06, 2010, 03:29:47 pm ---both asnwrs have been discussed befre , if u go back a few pages ull find them!
--- End quote ---
ur 777th post lol :D
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version