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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?

Respuesta :

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,

[tex]Z=(1-\frac{20}{100}).Z_{cal}=(1-0.2)\times40=0.8\times40=32[/tex]

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

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