Question

Calculate the chemical atomic mass of silicon.

Short answer

The chemical atomic mass of silicon is$28.0891amu$.

Step-by-step solution

Given information.

We have been given silicon atom.

We need to find the chemical atomic mass of silicon.

Simplify.

We know silicon atom occurs in three isotopes,

isotope : $S{i}^{28}$

amu : $27.9769$

abundance(%) : $92.18$

isotope : $S{i}^{29}$

amu : $28.9765$

abundance(%) :$4.71$

isotope : $S{i}^{30}$

amu : $29.9738$

abundance(%) :$3.12$

Now,

The chemical atomic mass of silicon , = $27.9769\times 92.18+28.9765\times 4.71+29.9738\times 3.12$

= $25.7891+1.3648+0.9352$

= $28.0891amu$