Why is it that the more stable the hydride formed by the reaction between halogen and hydrogen, the more heat is released?
H2+X2=2HX Q
The more stable the hydride, the greater the q; Q is also related to the amount of substances, and the relative atomic masses of Cl, Br and I increase gradually. Therefore, under the same mass, n (Cl2) >: n(Br2)>N(I2), the greater the q is.