Which change of phase is exothermic? A H
H2S(g) → H2S(1)
B. CO2(s) CO2().
C
H2O(s) –H2O(g)
D. NH3(1) NH3(9)

The mass has escaped into a gas which you can not see so the law stays true.

A) the enthralling of formation for pure element in its standard state is always positivehope this : )

The correct answer is c. orbital shape. "the angular momentum quantum number l describes the shape of an orbital. it corresponds to each orbital type, i.e. (0,1,2,−1)=(s,p,d,f,g,"

It is a ok  i know i have a brain functioning well.