How many hydrogen atoms in a #15*mol# quantity of water?

1 Answer
Feb 2, 2017

Answer:

#30xxN_A#, where #N_A="Avogadro's Number........."#

Explanation:

We could have equally asked how many hydrogen atoms are there in the #"ONE molecule of water?"# Of course there are 2.

The mole is simply another number, admittedly a very large number, i.e. #N_A=6.022xx10^23*mol^-1#.

And thus in a #15*mol# quantity there are approx. #9xx10^24# #"hydrogen atoms"#. What is the mass of this number of #"hydrogen atoms"#?