Question

the relative abundance of various isotopes of silicon is as Si-28 =92.23% , Si-29=4.67% and Si-30=3.1% what is the average atomic mass of silicon

Answer 1

$\huge \underline \mathscr \blue{Question}$

The relative abundance of various isotopes of silicon is as:Si 28=92.23%, Si-29=4.67% and Si 30=3.10%.What is the average atomic mass of silicon?

$\huge \underline \mathscr \pink{Answer}$

(.9223*28+.0467* 2970310 *30)/(.9223+.0 467+.0310)

=28.10

Answer 2

Average atomic mass = ∑(atomic mass of an isotope) × (Fractional abundance)

= 28(0.9223) + 29(0.0467) + 30(0.031)

= 25.824 + 1.354 + 0.93

= 28.108 u