I need help asap :( Its worth 60 points 20 grams of hydrogen reacted with oxygen to form 36 grams of H20 (water). How many grams of oxygen were used up in this reaction?

Mass of oxygen react = 32 g    

Explanation:

Given data:

Mass of hydrogen = 20 g

Mass of oxygen = ?

Mass of water formed = 36 g

Solution:

Chemical equation:

2H₂ + O₂     →      2H₂O

Number of moles of water formed:

Number of moles = mass/molar mass

Number of moles = 36 g/ 18 g/mol

Number of moles = 2 mol

No we will compare the moles of water with oxygen.

               H₂O          :             O₂

                 2            :              1

when two moles of water formed one mole of oxygen react.

Mass of oxygen react:

Mass = number of moles × molar mass

Mass = 1 mol × 32 g/mol

Mass = 32 g    

  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-

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.