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At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

What is the molar mass of potassium nitrate, kno3

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.