What is a #"mole"#?

1 Answer
Mar 17, 2016

Answer:

One mole of stuff contains #6.022140857(74)xx10^23# individual items of that stuff.

Explanation:

#6.022140857(74)xx10^23# is often abbreviated as #N_A#; it is simply a number, like 10, or a dozen, or a Bakers' dozen. It has the property that if there are #N_A# #""^12C# atoms, then there is a mass of #12.00# #g# precisely of #""^12C#. So, if have a mole of methane, #CH_4#, I have a mass of #16.00# #g#. In terms of #N_A#, how many (i) carbon atoms, and (ii) hydrogen atoms are present in #16.00# #g# of methane.