if you could just help me set them up the would do me some good. Thanx

You should limit your posts to one problem (or perhaps two small ones). I will try to help you with pieces of this.
A. In the single reaction of chlorine and potassium bromide, how many grams of potassium chloride can be produced from 200.g each of chlorine and potassium bromide? Identify the limiting reactants.

1. Write the equation and balance it.
Cl2 + 2KBr ==> Br2 + 2KCl

a. Convert 200 g Cl2 to mols. # mols = g/molar mass.
b. Convert 200 g KBr to mols.
c1. Using the coefficients in the balanced equation, convert mols Cl2 to mols KCl.
c2. Using the same procedure, convert mols KBr to mols KCl.
c3. Note that either c1 or c2 is larger. The smaller of the two will be the mols KCl that will be produced and that material will be the limiting reagent.
d. Convert mols KCl produced to grams.
g = mols x molar mass.

B. In the single replacement reaction of chlorine and potassium bromide, how many of potasuim chloride are produced from 75. g of potassium bromide?

Note: how many of what are produced by 75 g KBr. U suppose you mean how many grams of KCl etc.
Follow the same procedure for the first one except that you don't know have a limiting reagent for the problem has only one reactant, not two.
Convert 75 g KBr to mols.
Convert mols KBr to mols KCl
Convert mols KCl to g KCl.

C. Calcutate the % yield for the combustion reaction of methane, CH4, whe 100. g of methane react with an excess Oxygen gas to produce water and 230.g of carbon dioxide.

Write the balanced equation.
Convert 100 g CH4 to mols.
Using the coefficients in the balanced eqution convert mols CH4 to mols CO2.
Convert mols CO2 to g CO2.
Note how these problems are woked by the same procedure.
That number of grams of CO2 is the theoretical yield of the reaction.
% yield = [amt CO2 produced/theoretical yield]*100 = [230/theoretical yield]*100 = ??

I think you get the idea how to do them. These stoichiometry problems really just follow a simple pattern. Post any follow up questions about the others but show you work. It will make it easier to know what you don't understand.

how i can convert gm to KCL

So we have a question for chem. homework and i really don't understand. can you please explain it.....

Question:There is a change in the type of oxides formed with the period three elements. Indicate the type of compounds formed (ionic, amphoteric, covalent) when the period three elements react with oxygen. Give balanced equations.