# Solving Limiting Reactant Problems That's NH3 and it's a gas, that's why the g is in parentheses. That's also a gas, it's also called nitric oxide, not to be confused with nitrous oxide. If we multiply this times one and a half, 1.5, now we have three hydrogens on this side. How many oxygens do we have on the right-hand side? And then making sure that you understand the ratios.And we combine that with some oxygen, molecular oxygen, it's also a gas. I'll write nitrous oxide, it's N2O, this is laughing gas. 1.5 times 2, we have three hydrogens on the right-hand side. We have one oxygen here, and we have one oxygen in this molecule, but we have one and a half of the whole molecule. You understand this is a 4:5 ratio, there's always going to be less ammonia than oxygen.

That's NH3 and it's a gas, that's why the g is in parentheses. That's also a gas, it's also called nitric oxide, not to be confused with nitrous oxide. If we multiply this times one and a half, 1.5, now we have three hydrogens on this side. How many oxygens do we have on the right-hand side? And then making sure that you understand the ratios.

Next, to find the amount of excess reactant, we must calculate how much of the non-limiting reactant (oxygen) actually did react with the limiting reactant (ammonia). 1.70 g is the amount of ammonia that reacted, not what is left over.

To find the amount of excess reactant remaining, subtract the amount that reacted from the amount in the original sample.

One reactant will be completely used up before the others.

The reactant used up first is known as the ​limiting reactant.

Again, if we're given a problem where we know the quantities of both reactants, all we need to do is figure out how much product will be formed from each.

The smaller of these quantities will be the amount we can actually form.NOTE: It does not matter which product is chosen, but the same product must be used for both reactants so that the amounts can be compared.The reactant that produces the lesser amount of product: in this case the oxygen.Because hydrogen was the limiting reactant, let's see how much oxygen was left over: © 2003 by Ian Guch.All rights reserved including the right of reproduction in whole or in part in any form.You can also purchase this book at and Barnes & Noble.- The reactant in a chemical reaction that remains when a reaction stops when the limiting reactant is completely consumed.Likewise with chemistry, if there is only a certain amount of one reactant available for a reaction, the reaction must stop when that reactant is consumed whether or not the other reactant has been used up.A 2.00 g sample of ammonia is mixed with 4.00 g of oxygen.The first stoichiometry calculation will be performed using "1.75 mol O2" as our starting point, and the second will be performed using "2.75 mol H" is the smaller of these two answers, it is the amount of water that we can actually make.The limiting reactant is hydrogen because it is the reactant that limits the amount of water that can be formed since there is less of it than oxygen.

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