How much elements are in the periodic table?

In an energy pyramid, which level has the most available energy?

Asolid that forms and separates from a liquid mixture is called

When a chemist collects hydrogen gas over water, she ends up with a mixture of hydrogen and water vapor in her collecting bottle if the pressure in the collecting bottle is 97.1 kilopascals and the vapor pressure of the water is 3 2 kilopascals, what is the partial pressure of the hydrogen?