Question

A sample has 5 atoms with a mass of 11 amu and 2 atoms with a mass of 10 amu. What is the

average atomic mass?

Answer 1

10.7

Step-by-step explanation:

Calculate the contribution of each atom to the total mass by multiplying the mass (in amu( times the number of atoms.

(5 atoms)(11 amu/atom) = 55 amu

(2 atoms)(10 amu/atom) = 20 amu

Total is 75 amu spread over 7 atoms

(25 amu)/(7 atoms) = 10.7 amu/atom