The value of δh° for the reactiohe value of δh° for the reaction below is -790 kj. the enthalpy change accompanying the reaction of 0.95 g of n below is -790 kj. the enthalpy change accompanying the reaction of 0.95 g of s is kj.

Explanation:

You know how much S you have, so convert that to moles by dividing it with its atomic mass of 32g/mol

(0.95g S)/(32 mol S/g S)  =0.0297mole

then, you know for each 2 mol of S you put into the reaction, you get -790kJ so:

(0.0297mole)(-790kJ/2 mol S)= -11.7kJ

i don't have a calculator handy so you can just do that on your calculator.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

може ли да зареждате повече информация, моля