A sample of CO2 and a sample of H2 contain the same number of particles at STP. If the CO2 sample has been measured at 20mL, what volume must the H2 occupy in milliliters?

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.