How to calculate the number of moles of hydrogen atoms?

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Can someone please help me with Q12 c)? Thank you s much!

1 Answer
P dilip_k
Mar 13, 2017

The molecular formula of methane (#CH_4#) suggests that one molecule of this compound consists of 4 atoms of H.

So 1 mole of #CH_4# will have 4 mol atom of Hydrogen.

Now number of moles of #CH_4# in #5.2 xx10^24# molecules is

#=(5.2 xx10^24)/"Avogadro's number"#

So the number of moles of H atom in it

#=(4xx5.2 xx10^24)/"Avogadro's number"#

#=(4xx5.2 xx10^24)/(6.024xx10^23)~~34.5mol # atom

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