A solution of ammonia is made by dissolving 35 g of NH3 in 90.0 g of H2O. The density of the solution is 0.898 g/mL. Calculate the Molarity, Molality, Mass percent and mole fraction of Ammonia in this solution.

How many grams of naoh are needed to make 0.250 liter of a 0.500 m solution of naoh? 0.125 g 5.00 g 2.00 g

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?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )