# How would you calculate the average atomic mass of element,X, if a sample of X is 22.50% x-37 and 77.50% x-35.?

Average atomic mass$= \left(0.2250 \times 37\right) + \left(0.7750 \times 35\right) = 35.45$
Average atomic mass$= \left(0.2250 \times 37\right) + \left(0.7750 \times 35\right) = 35.45$