a student used 5.06g of a mixture of copper sulphate pentahydrate and salicylic acid in the perfomance of the experiment. the student recovered 3.094g of salicylic acid and 2.146g of copper sulphate pentahydrate. what is wrong with the student's reuslt? how might this error have been avoided​

15) a substance used in manufacturing gasoline consists of finely divided platinum supported on an inert solid. suppose that the platinum is formed by the high temperature reaction between platinum (iv) oxide and hydrogen gas. the other product is water. a) write and balance the equation b) how many grams of hydrogen are needed to produce 1.0 g of platinum metal? c) how many moles of water are produced at the same time? how many grams? ( show work, .)