What is the density of a gas at 273 k and 1 atm that has a molar mass if 50.0 g/mol?

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Describe the interaction that occurs between two objects with the same electrical charge.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.