[EMTMATT]

I am having difficulty with the following problems....


For the following single displacement reaction, find the limiting reactant for the case where you add 5.60 g Zn to 5.80 g HCL.

___ZN + _____HCL ------_____ZnCl2 + ______H2

a.  how many grams of H2 can be produced from this limiting reactant?

b.  If you collect 0.112 g H2, what is the percent yield for your reaction?



Phosphorous tricholoride, PCl3, is made by direct combination of phosphorus and chlorine.

____P4 + _____6Cl2 ----  _____PCl3


a.  What mass of PCL3 forms in the reaction of 125 g P4 and 323 g Cl2 if the percent yield is 89.3%?

b.  What is percentage yield if the reaction of 250.0 g P4 with 91.5 g of Cl2 produces 104g PCl3?




Note:  I need help balancing the equations too....


Thank You so much,

Matt

[Sev]

1st rxn: HCl has a coefficient of 2.  Work out how many moles of each reagent you have.  Which one is limiting, which one is in excess?

a.  how many grams of H2 can be produced from this limiting reactant?

b.  If you collect 0.112 g H2, what is the percent yield for your reaction?

a. Use mole ratios to find how many many moles of H₂ is produced.
b. Start by working out the theoretical yield.

[Padfoot]

How to balance chemical reactions:
http://richardbowles.tripod.com/chemistry/balance.htm