You need to know how many positive and negative ions and the formula for the following 2) potassium bromide
3) calcium oxide
4) magnesium sulfide
5) zinc chloride
6) sodium sulfide
7) strontium fluoride
8) lithium oxide
Zn27
9) potassium nitride
10) sodium phosphide
11) aluminum chloride
12) calcium nitride
13) aluminum oxide
14) magnesium phosphide
15) aluminum sulfide

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .