The Actual Matter Density of the Universe, Accounting for All

question 81

Multiple Choice

The actual matter density of the universe, accounting for all of the luminous matter and all of the dark matter known to exist in galaxies and clusters, is what fraction of the critical density?

• A) 1 percent
• B) 10 percent
• C) 25 percent
• D) 100 percent
• E) 200 percent

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Definitions:

Acetyl Chloride

A reactive organic compound used as a reagent in organic synthesis, characterized by an acetyl group bonded to a chloride.

N-Propylamine

An organic compound with the formula C3H7NH2, representing an amine where an amino group is attached to a propyl chain.

1-Bromopropane

An organobromine compound with the formula CH3CH2CH2Br, used as a solvent and an intermediate in organic synthesis.

Propan-1-Amine

An organic compound with the formula C3H9N, consisting of a propyl group attached to an amine functional group.