How many moles of bromine gas would occupy a volume of 20 L at a pressure of .90 atm and a temperature of 90 degrees Celsius? Remember 1 atm=101.3 kPa

The answer is the first option just took the test

Rn in the right answer

They cool it down and aluminum cools easily

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).