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Determine the mass of 5 moles H2

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Answer: 10.08 g

Step-by-step explanation:

I can understand how this can be confusing because I, too, struggle with molarity, finding mass, etc. With this one, all you have to do is look at the periodic table to get the mass of ONE single hydrogen atom. roughly 1.008g. Since it says "H2", that's letting you know that you are dealing with TWO hydrogen atoms. So now let's do some math!

So I told you that the weight of 1 Hydrogen is 1.008g , right? So the problem has "H2." So it's some simple algebra. 1.008 * 2 = 2.016g. So it wants to know the mass of 5 moles of the compound. When it comes to the moles, think of it asking the weight of a single atom that's in a bulk. Really all it's asking you is the weight of 5 moles of H2. So now we know that the weight of H2 as a whole is 2.016g. You'll then take 2.016 and multiply it by 5. 2.016g * 5 = 10.08 grams. So the answer should be 10.08 grams or close. I hope I helped!

User Nirajan Singh
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