CHEMISTRY HELP!!!!URGENT?

I've got a lab due tomorrow and I really have no idea what im supposed to do. Question:You are to determine the effect of increasing the concentration of 2 solutions on the percent yield. The solutions are calcium chloride + sodium carbonate monohydrate additional data: 100mL of 0.500dm^-3 solution of the... show more I've got a lab due tomorrow and I really have no idea what im supposed to do.

Question:You are to determine the effect of increasing the concentration of 2 solutions on the percent yield.

The solutions are calcium chloride + sodium carbonate monohydrate

additional data:
100mL of 0.500dm^-3 solution of the reactants was made.
Combined 25mL of each reactant in a beaker and let it filter to make chalk, then measured the mass
now the independent variable is the concentration so 20mL, 15mL, 10mL, and 5mL
I just really need to know how to get the percent yield and solve the lab question.
please!! thanks for any help I've been trying for 5 hours now you guys are my last hope.
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