Which of These Statements Concerning the Atomic Mass Is Correct

question 35

Multiple Choice

Which of these statements concerning the atomic mass is correct?

• A) The a tomic mass is the same as the mass number of the most common isotope.
• B) The atomic mass is derived from the weight of the most common isotope of an element.
• C) The atomic mass is determined by adding the masses of the protons, electrons, and neutrons in the atom.
• D) The atomic mass is calculated from the atomic masses of the two most common isotopes.
• E) The atomic mass is a weighted average of the masses of the naturally occurring isotopes.

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Definitions:

M-xylene

An isomer of xylene with two methyl groups attached to the benzene ring in the meta positions, used as a solvent and chemical precursor.

Aromatic C-H Stretch

A characteristic vibrational mode observed in infrared spectroscopy, typically occurring in the region of 3100 to 3000 cm^-1, indicative of aromatic hydrocarbons.

C Stretch

Refers to the carbon-hydrogen bond stretching vibration observed in infrared spectroscopy, indicative of specific organic functional groups.

Peaks

In the context of spectroscopy, refers to the points on a graph that represent the maximum absorption or emission of energy by molecules at specific wavelengths or frequencies.