A 5.0 g sample of dry ice (solid carbon dioxide) turned into 2400 cm^3 of carbon dioxide gas at rtp. What was the
percentage purity of the dry ice? (Mr of CO2 = 44.)

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.