How many moles of helium would occupy a volume of 1.255 L at a pressure of 1.47 atm at a temperature of 21℃? R = 0.0821 L*atm/mol*K I WILL GIVE BRAINLIEST

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

1. list three scientific reasons cockroaches may fly.

Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.