How many moles of hydrogen is in 4.923 grams of hydrogen?

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Which statement is true according to the kinetic theory? a. molecules of different gases with the same mass and temperature always have the same average density. b. molecules of different gases with the same mass and temperature always have the same average volume. c. molecules of different gases with the same mass and temperature always have the same pressure. d. molecules of different gases with the same mass and temperature always have the same molecular mass. e. molecules of different gases with the same mass and temperature always have the same average kinetic energy.

Why sncl2 is solid while sncl4 is liquid at room temprature explain it in easy way