Which has the greater mass, 1.204x1024 molecules of molecular hydrogen or 1.204x1024 molecules of water?
by 
mccarthy
ANSWERS: 4
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the water molecules molecular mass of hydrogen = 2 molecular mass of water = 18
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... the water ...
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I am not trying to be offensive here, but this is the sort of thing that drives me crazy as a teacher. People not being able to think their way through a simple problem such as this. Note, you have the same number of molecules in both cases. So, you can ignore the repeated "1.204x1024 molecules of " from the question. It is just there to distract you and make the question seem more complicated than it really is. The real question is, "Which has the greater mass, a molecule of hydrogen or a molecule of water?" All you need to know to answer this question is the formulas for both molecules, H2 & H2O. At this point you see that the formulas are the same except that water has an oxygen atom in addition to the two hydrogen atoms. So, of course the water molecule is going to have the greater mass. You don't even have to pull out a Periodic Table to answer this question. All you have to do is think your way through it. So, please try actually using your brain instead of trying to get us to do your homework for you.
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water
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