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Hi there.
00:03
In this question, we are given this balanced chemical equation.
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I have omitted the states of matter because they are not needed for what we're using the equation for.
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What we're using the equation for is the mole ratio.
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And that comes from the coefficients in the balanced equation.
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So what we see here from those coefficients is that four moles of ammonia will react with seven moles of oxygen, in turn producing four moles of the no2 and six moles.
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Of the h2o.
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So this is our mole ratio.
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It shows us the ratio in which the reactants react and the products are formed.
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Well what we're given in this problem is 8 .0 moles of the ammonia and 14 .0 moles of the oxygen.
00:53
And we want to know how many moles of water are going to be produced.
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Okay, so frequently when we have this type of problem and we have an amount for each reactant, frequently what has happens is we run out of one of these first.
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And what that's referred to as is the limiting reactant because it will limit how much product will be made.
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Once we run out of one of the reactants, we can't make any more product.
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The reaction will stop.
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So for that reason, i need to convert each of these to moles of water and see which one we run out of first.
01:31
In other words, which one makes less water.
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Because that is the maximum amount of water.
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Water we can make.
01:38
Okay, and i'm going to use the mole ratio to help me out here...