A closed container has 5.60 x 1023 molecules of oxygen gas (O2). How many moles is that?
1 answer:
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Given,
The two isotopes of B are 10B and 11B
% abundance of 10B = 19.80
% abundance of 11B = 80.20
Average atomic mass of B
=
=
=
=
= 10.802
Therefore, the average atomic mass of B is 10.802 u