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April 21, 2014

Homework Help: Physics

Posted by ana on Friday, November 20, 2009 at 6:35pm.

How many atoms of hydrogen are in 220g of hydrogen peroxide (H2O2)?

This is what I did so far:

the molecular weight of H2O2 = 2*1 +2*16 =34

therefore, there are 220/34 moles of the molecule = 6.47 moles, so there are 6.47xAvogadro's number of molecules

there are 2 H atoms per molecule, so multiply 2x6.47x(6.02e^23) which is 7.591084947e^11
but for some reason it is wrong

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