Your science teacher hands you a small container filled with an unknown liquid substance. he asks you to measure the mass of the liquid. what lab equipment will you use and how do you calculate the mass of just the liquid? be sure to describe the process you would follow step-by-step.

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, .)