Enthalpy of Reaction: Using standard enthalpies of formation (AHY) from Table A4.3 in your textbook or below, calculate AH° for the following reactions.
2 NH3(g) + 3 O2(g) + 2 CH4(g) → 2 HCN(g) + 6 H2O(g) (1pt)
Ca3(PO4)2(s) + 3 H2SO4(aq) + 3 CaSO4(s) + 2 H3PO4(aq) (1 pt)
2 NO2(g) → N204(g) (1 pt)
2 Al(s) + Fe2O3(s) → Al2O3(s) + 2 Fe(s) (1 pt)
Substance
Ca3(PO4)2(s)
H3PO4(aq)
AH (kJ/mol)
-4132
-1277

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.