Think about the lab procedure you just read. label each factor below with v for “variable” or c for “constant”. the temperature of the gas: the amount of gas in the tube (in terms of mass and moles): the radius of the tube: the temperature of the gas (changed by the water surrounding it): the type of gas: the pressure of the gas:

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, .)