If the total pressure of water vapor and hydrogen gas is 1.02 atm and the partial pressure of the water at 22.0 c is 0.13 atm, what is the pressure of the hydrogen gas?

0.89 atm  is the pressure of the hydrogen gas

Explanation:

We can use the molar fractions to solve this

Sum of molar fractions (hydrogen + water vapor) = 1

Molar fraction = Pressure gas / Total pressure

Molar fraction water vapor = 0.13 atm/1.02 atm = 0.127

1 - 0.127 = 0.873 (Molar fraction H2)

0.873 = Pressure H2 / Total pressure

0.873 = Pressure H2 / 1.02 atm

0.873 . 1.02atm = 0.89 atm

  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-