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May 22, 2015

Homework Help: Physics

Posted by ana on Wednesday, November 18, 2009 at 11:24pm.

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

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 2x6.47xNa to get the final answer (Na=Avogadros Number)...
but for some reason it isn't given the right answer

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