None of them.
The formation reaction is the equation for 1 mole of the material to form from its basic parts. For CaO, it is
Ca(s) + 1/2 O2(g) ==> CaO(s)
I suspect you made a typo on c and that is the correct one but I may be wrong. AND, AND, AND this is VERY important, there are no correct answers anyway because there are no arrows. With no arrows we don't know where reactants end and products begin.
Which of the following is the formation reaction for CaO(s) ?
A. CaO(s) Ca(s) + 21O2(g)
B. Ca2+(aq) + O2–(aq) CaO(s)
C. Ca(s) + 21O2(g) CaO(s).
D. 2 Ca(s) + O2(g) 2CaO(s)
E. 2 CaO(s) 2 Ca(s) + O2(g)
1 answer