2 HF + Ca(OH), CaF,+ 2H,0 How many moles of calcium hydroxide,
Ca(OH), are needed to completely react with
18.7 moles of hydrofluoric acid, HF?

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

How are isotopes of the same chemical element alike? how are they different?

Amethod of separation that employs a system with two phases of matter, a mobile phase and a stationary phase, is called