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Unfortunately, you’d have to compare whether or not the amount of moles you have is greater than the amount of moles you need; sometimes you can get a hint from the ratios, but most of the time the stoichometric coefficients and the sheer amount are not enough to tell
The limiting reactant is not necessarily always the one with the smallest number of moles. To determine which reactant is limiting, you have to compare the moles of each reactant to the ratios in the balanced chemical equation.
Not necessarily, you first would have to see which ratio you need using your balanced chemical equation and then convert the grams you were given into moles and see if it fits the ratio, you have. If it does not you have to check if it either has more or less than you need and evaluate from there.
I have found it easiest to find the limiting reactant by solving for how much product can be produced. This can be used by solving for the amount of moles there are of each reactant and using the molar ratio to solve for the grams of a product and whichever reactant produces the smaller amount of product that is your limiting reactant. Sorry for a confusing explanation.
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