A piece of aluminum foil \(1.00 \mathrm{~cm}^{2}\) and 0.550-mm thick is allowed to react with bromine to form aluminum bromide.
(a) How many moles of aluminum were used? (The density of aluminum is \(2.699 \mathrm{~g} / \mathrm{cm}^{3}\) .)
(b) How many grams of aluminum bromide form, assuming the aluminum reacts completely?
Text Transcription:
1.00 cm 2
2.699 g/cm 3
Step 1 of 5) How many moles of aluminum were used (The density of aluminum is 2.699 g/cm3 .)(b) How many grams of aluminum bromide form, assuming the aluminum reacts completelyThe First Law of Thermodynamics Energy comes in many different forms, including kinetic energy, which we encountered in Chapter 1, and various types of potential energy. You don’t have to look far to find processes that involve conversions from one form of energy to another. Dropping a stone down a deep well converts gravitational potential energy into kinetic energy. Heating your house by reacting natural gas with oxygen converts chemical energy into heat. In both cases—and every other one you can imagine—energy can be converted from one form to another, but it is neither created nor destroyed. This observation, one of the most important in all of science, is known as the first law of thermodynamics. To apply this law quantitatively we need to divide the universe into a finite system of interest to us, and define the energy of that system more precisely. We explore these concepts next.
