Don’t really understand on how to do this.

3) 333.75 Grams

Explanation:

2Al + 6HCl --- 2AlCl3 + 3H2

Work out and label what we know and workout Ar and Mr

Al = 67.15grams         AlCl3

Al = Ar=27                  Mr = 133.5

Mass/Mr == Moles

Al = 2.5 Moles          AlCl3 = 333.75

Moles * Mr = Mass

2.5 * 133.5 = 333.75 Grams

4) Apply the same concept (numbers in front of elements are ratios, in this case 12 and 8) (when working out MR/AR ignore numbers in front)

1) Workout Mr/Ar (The relative atomic masses added up)

2) Do 36.72/(Mr of O2) = Your Moles

3) Do workout what the moles would be in the ratio 12:8 (Times/divide moles to find out the correct moles for 12:8

4) Times the new moles by the Mr of SO3

5) = Answer

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.