How many moles of Ca[OH]2 are present in 80.0 g of Ca[OH]2?

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?

Is the idea of spontaneous generation supported by redi's experiment? justify your answer in 2-3 sentences?