How many ions of potassium are in 2.4 moles of k3n?

how many moles are in 45 grams of bef2?

how many grams in .83 moles of li2o?

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules

Asolution of naoh has a concentration of 25.00% by mass. what mass of naoh is present in 0.250 g of this solution? use the periodic table in the toolbar if needed. 0.0625 g what mass of naoh must be added to the solution to increase the concentration to 30.00% by mass? g

How much mass would a mole of hydrogen molecules contain? recall that hydrogen is diatomic. g/mol