Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? a burning fossil fuels contributes to climate change. b burning fossil fuels takes place inside expensive fuel cells. c fossil fuels aren’t widely available, but pure hydrogen is. d fossil fuels are nonrenewable.?

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .