1) what mass of aluminium oxide is produced when 135g of aluminium is burned in oxygen? 2 AI + 3 O2 —> AI2O3

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

1 a

2 d

3 a

4 c

explanation:

answer; talc and gypsum;

the right answer is c i just did the question.