Boron? how to find the atomic weight?

1 ⤊

Boron? how to find the atomic weight?

with the info on Boron, determine the average atomic mass:

Isotope: B-10 Percentage 18.88 and weight (u) 10.00
and
Isotope: B-11 Percentage 81.12 and weight (u) 11.00

how do i figure this out??

2007-02-26 07:09:03 · 3 answers · asked by laural8477 3 in Science & Mathematics ➔ Chemistry

3 answers

18.88% weight 10 and 81.12 weight 11

0.1888 * 10 + 0.8112 *11 = avg weight = 10.8112

2007-02-26 07:14:05 · answer #1 · answered by Dr Dave P 7 · 0⤊ 0⤋

(% of B10* 10)+(% of B11*11)

so its

(0.1888*10)+(0.8112*11)

ill let you calculate it

2007-02-26 15:14:10 · answer #2 · answered by Kev P 3 · 0⤊ 0⤋

you multiply percentage by mass and add like:

.1888 * 10.00 + .8112 * 11.00

2007-02-26 15:11:39 · answer #3 · answered by Anonymous · 1⤊ 0⤋