# Chemistry

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How do you calculate the atomic mass of an element when an isotopic composition is given
99.985% 1H; 0.015% 2H

• Chemistry -

The idea is the sum of the parts is equal to the whole.
100*avgatomicmass= 99.985*1 + .015*2

solve for avgatomicmass.

• Chemistry -

• Chemistry -

How???

• Chemistry -

divide both sides by 100.
then on the right, muliply the terms and add.

• Chemistry -

Can you please show how in long form so I know how to do it! Thanks

• Chemistry/ bob -

• Chemistry -

Can you please show how in long form so I know how to do it! Thanks

• Chemistry -

ANYONE!!!

• Chemistry -

Here is what Bob Pursley wrote.
100*avgatomicmass= 99.985*1 + .015*2

Here is a rewritten form of his equation although his instructions for solving the equation are simple.
100*x = [99.9985*1 + 0.015*2]
solve for x which is the average atomic mass.

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