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

Answer 1

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

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"#?

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Answer 2

Axel Alvarado

In a 15 mol quantity of water, there are approximately 9.03 x 10^24 hydrogen atoms.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.