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If I understood your question correctly, then in order to figure out the theoretical yield of a specific product, you would have to use the moles of the limiting reagent and multiply by the molar ratio of the product to the limiting reagent given in the chemical equation to find the maximum moles of product. And then for theoretical yield, you just use molar mass to find the maximum moles of product in grams!
The molar ratio between the two reactants is essential for determining the limiting reactant. However, once you find the limiting reactant you do not need to use the molar ratio between the reactants to determine the theoretical yield. You will be using the molar ratio between the limiting reactant and the product to determine how many moles of the product will be formed.
You have to know the molar ratio between both reactants in order to find which one is the limiting reagent. Once you find the moles of each product, you have to use the molar ratios when calculating the amount of product for each given mole. Once you have the mass of both products, you can see which one is less and is therefore the limiting reagent.
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