Achunk of dry ice, solid co2, "disappears" after sitting at room temperature for a while. there is no puddle of liquid. what happened?

a-the solid co2 sublimed.
b-the solid co2 melted.
c-the solid co2 underwent deposition.
d-the solid co2 underwent fusion.

What volume does 1.70 ×10–3 mol of chlorine gas occupy if its temperature is 20.2 °c and its pressure is 795 mm hg?

How many moles of potassium are needed to react completely with 12.8 moles of magnessium bromide?

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.