How many moles of tungsten (w,183.85 g/mol) are in 415 grams of tungsten?

Answer : The moles of tungsten is, 2.257 moles

Explanation : Given,

Mass of tungsten = 415 grams

Molar mass of tungsten = 183.85 g/mole

Formula used :

Now put all the given values in this formula, we get :

Therefore, the moles of tungsten is, 2.257 moles

  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-