Which conversion factor would you use to correctly calculate the number of moles in 25.0 g of the element titanium (ti) ?

a). 1 mol ti/ 25.0 g ti
b). 6.02 × 10∧23 mol ti/25.0 g ti
c). 47.88 g ti/ 1 mol ti
d). 1 mol ti /47.88 g ti

  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-