Calculate the number of gram - atoms and gram - molecules in 48 g of oxygen

3 gram, 1.5 gram molecules

Explanation

Atom mass of O is 16 U

number of gram atom of oxygen= mass/gram atomic mass

gram atomic mass is the mass of the substance represented in grams.

Gram atomic mass of oxygen is 16g.

number of atoms= 48/16= 3gram atom of 0

Molecular mass of oxygen Is 32g.

Number of gram molecules

= gram/ mass

=48/32= 1.5 molecules

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  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-