If 4.50 g of (nh4) 2so4 is dissolved in enough water to form 250. ml of solution, what is the molarity of the solution?

The molarity of a solution is the number of moles of a substance in one liter of that substance.

The molar mass of ammonium sulfate (NH4) 2SO4 is 132.14 grams/mole

Calculate the moles of ammonium sulfate:

(4.50 grams) / (132.14 grams/mole) = 0.0341 moles of ammonium sulfate

convert mL to Liters 250. mL becomes 0.250 liters

Take the number of moles over the number of liters

0.0341 moles / 0.250 liters = 0.136 molar or 0.136M = molarity of the solution