Use the references to access important val a piece of an unknown metal has a volume of 19.7 ml and a mass of 427.0 grams. the density of the metal is g/ml a piece of the same metal with a mass of 64.9 grams would have a volume of submit answer

The density of the metal is 21.675 g/mL.

The volume of metal with mass of 64.9 grams is 2.994 mL.

Explanation:

Density is defined as mass present in unit volume of the substance.

Mass of unknown metal = m = 427.0 g

Volume of the unknown metal = v = 19.7 mL

Density of the unknown metal = d

Mass of the same unknown metal = M = 64.9 g

Volume of same unknown metal with mass M = V

Density of the metal  = d = 21.675 g/mL

V = 2.994 mL

  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-