1. Calculate the average atomic mass for gallium if 60.00% of its atoms have a mass of 68.926 amu and 40.00% have a mass of 70.925 amu.
2007-12-11 11:06:34 · 3 answers · asked by Chelsey 5 in Science & Mathematics ➔ Chemistry
The answer is 69.73 amu ..I need the steps.
2007-12-11 11:07:18 · update #1
Here you go.
.60 x 68.926 = 41.3556
.40 x 70.925 = 28.37
28.37 + 41.3556 = 69.7256 or round to 69.73
2007-12-11 11:13:19 · answer #1 · answered by Steve V 1 · 1⤊ 0⤋
It's just a weighted average: 60.00% x 68.926 + 40.00% x 70.925.
I don't believe those percentages to 4 sig figs and so full of zeros, but that's not your problem.
2007-12-11 19:13:54 · answer #2 · answered by Facts Matter 7 · 0⤊ 0⤋
68.926x0.60=41.356
70.925x0.40=28.3700
41.356+28.3700=69.72
Taadaaa :)
2007-12-11 19:17:51 · answer #3 · answered by karamba_power 2 · 0⤊ 0⤋