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RJ RJ
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11 years ago
What exactly does excess hydrogen mean and how would you go about solving this stoichiometry problem?
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#1
11 years ago
Hello,

As you know the equation for the formation of water is O2 + 2H2 Rightwards Arrow 2H2O. The hydrogen mentioned in this equation is the H2.

Since the limiting reactant is oxygen, you first have to convert 55 g O2 to moles of O2.

Then, use PV = nRT to solve for liters of oxygen.

Finally, use the stoichometric conversions to find the liters of water.
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#2
11 years ago
Your instructor is being really kind to you giving you STP conditions.

So the first thing is to write a balanced equation:

H2 + O2 -------> H2O

And NO, I did not balance the equation for you.  But from the molar ratio, knowing how many moles 55 grams of oxygen is will allow you to calculate how many moles of water will be formed.

Excess hydrogen means you have all the hydrogen you would want, so that amount is not needed for any calculations.

And the MW of water is 18, and density is considered 1 gram/mL.
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