Cho hợp chất MgO và hợp chất RCl3. R và O tạo thành hợp chất mới trong đó O chiếm 47% khối lượng hợp chất. Xác định R

answer; economic order quantity;

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.

c. 75.7

i think that is the right

c

explanation: