What a hotspot mainly about like what's it's definition ?

Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2al(s)+3cl2(g)→2alcl3(s) what is the maximum mass of aluminum chloride that can be formed when reacting 32.0 g of aluminum with 37.0 g of chlorine? express your answer to three significant figures and include the appropriate units.

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

May someone me with these science questions