Find the [OH-] of a 9.70 x 10^-5 M HCl solution

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory

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 this correct if not can u correct me