What would be the pressure exerted by 0.0718 moles of gas with a volume of 12.75 liters and at a temperature of 17oC?

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Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Summarize possible ways in which phases of matter could combine to form a solution.