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anonymous
 4 years ago
Lithium has two isotopes.
Li6 and Li7.
Li6 mass = 6.015121amu
Li7 mass = 7.016003amu
Lithium Mass = 6.94049amu
What is percent abundance of Li6?
I know that there is an equation:
6.9409 = (% Abundance Li6 * Weight of Li6) + (% Abundance Li7 * Weight of Li7)
I don't know how to use it.
anonymous
 4 years ago
Lithium has two isotopes. Li6 and Li7. Li6 mass = 6.015121amu Li7 mass = 7.016003amu Lithium Mass = 6.94049amu What is percent abundance of Li6? I know that there is an equation: 6.9409 = (% Abundance Li6 * Weight of Li6) + (% Abundance Li7 * Weight of Li7) I don't know how to use it.

This Question is Closed

JFraser
 4 years ago
Best ResponseYou've already chosen the best response.0you have all 4 pieces, plug them in

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Okay. SO 6.9409 = % Li6 * 6.015121 + % Li7 * 7.016003 But this gives me two variables...

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0100% is the sum of the two. 100% = Li 6 + Li 7 Li 6 = 100% Li7

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So 6.409 = %Li6 * 6.015121 + (100%  %Li6) * 7.016003 Confused... 100% * 7.016003 = 701.6003? That is a big number.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Well ask yourself if this statement makes sense: The percent abundance of Li6 is 701.6%.
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