When (1.89x10^2) g of magnesium hydroxide decomposes, magnesium oxide and water form. What mass of magnesium oxide forms?

Litmus paper is made from water-soluble dyes which are extracted from lichens. this paper is used as an acid-base indicator. which of these common household substances would turn blue litmus paper red? a) bleach b) lye c) soap d) vinegar

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

Label a-f based on the table using c for concentrated and d for dilute