3 years ago

Which theory allows physical scientists to quantify or measure things like energy

1 answer:

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Answer is: quantum theory (mechanics).
Quantum theory is theory in physics which describes nature of energy levels of atoms and subatomic particles. Quantum theory is formulated in different particularly developed mathematical formalisms.
According to this theory energy of a system may be restricted to discrete values (quantization).

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The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table b

denis-greek [22]

Answer:

220.42098 amu

Explanation:

(220 .9 X .7422) + (220 X .0.1278) + (218.1 X 0.13) = 220.42098 amu

These are weighted averages.

So, we will take mass of one and multiply by abundance percentage that is provided and add them together.

In order to calculate the average atomic mass, we have to convert the percentages of abundance to decimals. So, you get

(220 .9 X .7422) + (220 X .0.1278) + (218.1 X 0.13) = 220.42098 amu

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