Question #ba64c

1 Answer
anor277
Sep 6, 2017

Let's underthink the problem....suppose you had #"3 dozen"# individual water molecules, i.e. #36# molecules......

Explanation:

Do you agree that in this scenario we gots 36 individual oxygen atoms, and 72 hydrogen atoms? Yea or nay?

The question here specified #3.4*mol# water molecules, which has a mass of #3.4*molxx18.01*g*mol^-1=61.2*g# of water......

But a mole is simply a numerical quantity....i.e. #N_A=6.022xx10^23*mol^-1#.

And so back to your problem, we gots....

#3.4xxN_A# #"oxygen atoms"# #=# #2.05xx10^24# #"oxygen atoms"#.

And......

#2xx3.4xxN_A# #"hydrogen atoms"# #=# #4.09xx10^24# #"hydrogen atoms"#.

And the moral, the mole is simply a number, admittedly a very large number.......with the property that a mole of #"hydrogen atoms"# has a mass of #1*g#.

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