What is the number of moles of beryllium atoms in 36 g of be? 0.25 mol 4.0 mol 45.0 mol 320 mol?

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

Calculate the number of molecules present in 0.750 mol of mgo.

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution