Given the following enthalpy changes, Iz(g) + 3Cl2(g) → 21013(s); AH = -214 k mol-1
Iz(s) - 13(g); AH = +38 kJ mol-1
What is the standard enthalpy change of
formation of iodine trichloride, IC13(s)?

A. +176 kJ mol-1
B.-214 kJ mol-1
C.-176 kJ mol-1
D.-88 kJ mol-1​

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-