Homework Help: chemistry grade 12 science

Posted by kite on Wednesday, February 4, 2009 at 5:10pm.

Q. When 300ml of TiCl4(gas), at 48 degrees celcius and a pressure of 105.4kPa, is reacted with 0.4320 g of magnesium, 0.4016 g of titanium is produced.
TiCl4(gas) + 2Mg(solid) --> Ti(solid) + 2MgCl2(solid)
Calculate the percentage yield for this reaction

- The answer for this question is 94.43%, but i don't know HOW to get it.

chemistry grade 12 science - bobpursley, Wednesday, February 4, 2009 at 5:24pm
Find the Moles of TiCl4 from the ideal gas law. PV=nRT.
Now, the balanced equation shows one mole of Ti for every mole reacted. You actually got a yield of .4620/molesTiorig

It is not necessary to see if the Mg was the limiting reagent, because you are asked for the yield with that specified. However, in the real world, it would be helpful to know if enough Mg was supplied, if one were in the business of producing Ti.

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