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Topic: limiting reactant  (Read 7878 times)

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meee45

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limiting reactant
« on: December 11, 2005, 02:30:19 PM »
wats the limiting reactant for this quest...

2Al + 3CuCl3 -------------> 3CU + 2AlCl3

Aluminum - 0.25 g
copper (II) chloride  - 0.51 g

i keep getting CuCl2 but the way im doing it is wrong....am i suppose tp calculate the amount of Cu produced or AlCl3? som1 plz  help

Offline Alberto_Kravina

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Re:limiting reactant
« Reply #1 on: December 11, 2005, 02:34:04 PM »
1.)Balance the reaction equation and make sure that you use the correct formulas
2.)calculate how many moles 0.25g of Al and 0.51g of CuCl2 are

Show your results and you'll get other instructions!

meee45

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Re:limiting reactant
« Reply #2 on: December 11, 2005, 02:38:21 PM »
a). its already balanced

b). # mol. Al = 0.25g / 26.98 g/mol
                   = 0.009mol

    # mol CuCl3 = 0.51g / 169.9 g/mol
                       = 0.003 mol

Offline Mr. Raru

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Re:limiting reactant
« Reply #3 on: December 11, 2005, 02:52:24 PM »
a) your reaction is not balanced properly
Copper (II) chloride would be CuCl2 as Alberto mentioned.
CuCl3 would be Copper (III) chloride. So which one was your question? Because you said you were given the amount of copper (II) chloride, but then you switched your conversion for copper (III) chloride

meee45

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Re:limiting reactant
« Reply #4 on: December 11, 2005, 03:04:47 PM »
soo sorry i typed it wrong

its actually 2Al + 3CuCl2 ------>3Cu + 2AlCl3

so yea its balanced. but my quest. is that am i suppose to calculate the amount of Cu produced from each reactant or the amount of AlCl3 produced.
 i hav the rite ans. but its jus that my cal. is wrong...

Offline Mr. Raru

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Re:limiting reactant
« Reply #5 on: December 11, 2005, 03:42:55 PM »
either one should give you the right answer. The gfm of CuCl2 is 134.45 so that may be why you are having trouble. If you calculate the Cu produced from each of the reactant, you can find the limiting reactant by comparing the yield. The reactant that produces less Cu is your limiting reactant.

meee45

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Re:limiting reactant
« Reply #6 on: December 11, 2005, 03:46:42 PM »
thank you sooooooooooooo much!

Offline Borek

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Re:limiting reactant
« Reply #7 on: December 11, 2005, 03:55:32 PM »
Red means in excess  8)
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

meee45

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Re:limiting reactant
« Reply #8 on: December 11, 2005, 04:31:21 PM »
lol thats so cool. thank u for your help.  ;D ;)

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