The atomic mass of an element is equal to. Its mass number its atomic number one

Question

The atomic mass of an element is equal to. Its mass number its atomic number one-twelfth of the mass of a carbon-12 atom a weighted average mass of all of the naturally occurring isotopes of the element the average mass of all of the naturally occurring isotopes of the element A sample of chlorine has two naturally occurring isotopes. The isotope C1-35 (mass 35.0 amu) makes up 85.05 of the sample, and the isotope C1-37 (mass = 37.0 amu) makes up 15.0% of the sample Based on this data, what is the average atomic mass for chlorine? 35.0 amu 35.3 amu 35.5 amu 71.0 amu 72.0 amu Naturally occurring europium (Eu) consists of two isotopes with a mass of 151.0 and 153.0. Europium-151 has an abundance of 30.00% and Europium-153 has an abundance of 70.00%. Based on this data, what is the average atomic mass for europium? 151.0 amu 151.4 amu 152.0amu 152.4 amu 6.022 X 10^23 amu

Explanation / Answer

7) Atomic mass units by international agreement, 1 unified atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom (at rest).

8) (35*.85) + (37*.15) = 35.30

9) (151*.30) + (153*.70) = 152.40

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