Question

Calculate the average atomic mass of an unknown element if 95.00% of all the atoms have a mass of 31.972 amu, 0.76% has a mass of 32.971 amu and 4.22% have a mass of 33.967 amu. Record your answer to 4 decimal places.

Answer 1

32.06 amu

Step-by-step explanation:

(31.972 amu x 95%) + (32.971 amu x 0.76%) + (33.967 amu x 4.22%) =

(31.972 x .95) + (32.971 x .0076) + (33.967 x .0422) =

30.3734 + .2505796 + 1.4334074 = 32.057387 = 32.06 amu

The unknown element is Sulfur.