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After figuring out which is an excess and limited reactant, how are you able to calculate what is remaining of the excess reactant? Is it Total Reactant-Reactant Used? If so then how do you determine how much of the excess is used?
You have to calculate how much of the reactant is used up in the reaction by converting it from the product produced. Then you subtract the amount of the reactant that was used up from the amount of that reactant that you had to begin with.
To find the excess reactant leftover, you take the limiting reactant and compare the mole ratio of the excess to the limiting reactant to find the moles of the excess that is actually used. Then convert to grams and take the theoretical amount (what you calculated at first) - the actual amount using the limiting reactant to give you the amount leftover. So yes it is total reactant- reactant used! And to determine how much of this excess is used, you use the limiting reactant and compare to mole ratio.
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