Determine the theoretical yield of calcium sulfate if you start with 200 g of calcium hydroxide and 150 g of ammonium sulfate

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.