can you answer #43 in general chemistry book for the average mass of magnesium and show...
can you answer #43 in general chemistry book for the average mass of magnesium and show the calculations including significant figures because I got 24.30 with the significant figures ending there and on the periodic table it says 24.305 to one more significant figure.
Homework Answers
The atomic mass of the elements in periodic table is calculated depending upon the weighted average of the individual isotopes present.
The abundance of Mg isotopes are 78.99% of 23.98504 u, 10.00% of 24.98584 u and 11.01% of 25.98259 u. i.e., 78.99%+10%+11.01%=100%
To calculate atomic mass we can use ratio maths.
(0.7899 x 23.98504) + (0.100 x 24.98584) + (0.1101 x 25.98259) = 24.30505 amu.
You calculated the atomic Weight of Element which is rounded to nearest whole number.
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