Question

15%, the price of a shirt is $51. What was the original price of the shirt? 5. The atomic weight of an unknown element, in atomic mass units (amu), is approximately 20% less than that of calcium. The atomic weight of calcium is 40 amu. What is the atomic weight, in amu, of the unknown element?

Answer 1

Given that atomic weight of calcium is 40 amu.

And the atomic weight of the unknown element is 20% less than the atomic weight of calcium,

$Z=(1-\frac{20}{100}).Z_{cal}=(1-0.2)\times40=0.8\times40=32$

Thus, the atomic mass of the unknown element is 32 amu.