Calculate the quantity of heat in joules required to completely vaporize 100 grams of H2O() at 100.°C and 1.0 atm.

The quantity of heat : 226,000 J

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

Q = m. Hf

Hf = heat of fusion

Heat required for vaporize /evaporated can be calculated from

Q = m . Hv

m = mass, g

Hv = the heat of vaporization, for water = 2,260 J/g

So :

  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-

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