1 point Determine the value of the enthalpy change, Delta H vap, for the evaporation of one
mole of water using the information below.
H2O(l) → H2O(g)
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(1)
CH4(g) + 2O2(g) → CO2(g) + 2 H2O(g)
Delta H= -890.5 kJ/mol
Delta H=-802.3 kJ/mol

  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-

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.