Posted by Joseph on Thursday, December 9, 2010 at 3:35pm.
2X + 3Cl2 ==> 2XCl3
1.350..y......6.67
mass Cl2 combined must be 6.67-1.35 = 5.29g
Then I would convert grams to moles. moles = grams/molar mass.
Cl2 = 5.29/35.44 = 0.1501
X = 1.350/molarmass = ??
If the formula in the problem is given as XCl3, we know then that ??moles x must be 0.15/3 = 0.05
Now, 1.35/molar mass = 0.05 and solve for molar mass. I get 26.97 but I've estimated here and there and you should do it more accurately. For the last part, 1.00 g X = 1.00/26.98 = 0.0371. Convert to moles XCl3 and that will be 0.0371 x (2 moles XCl3/2 moles X) = 0.0371 moles XCl3. Now convert to grams.
g = moles x molar mass = 0.0371 x 133.34 = 4.94 g.This is the theoretical yield.
%yield = (actual yield/theoretical yield)*100 = ??
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