5.2 cm of a metal is found to weigh 46.6 g on a three decimal balance. what is the density of the metal, expressed to the proper number of significant figures? 9 g/cm [2] 9.0 g/cm 8.96 g/cm 0.11 g/cm [5] 0.112 g/cm

option [3] 8.96 g/cm³

Explanation:

Given;

Volume of the metal = 5.2 cm³

Weight of the metal = 46.6 g

Now,

the relation between the density, mass and volume is given as;

Density =  Mass / volume

on substituting the respective values, we get

Density = 46.6 / 5.2

or

Density = 8.96 g/cm³

Hence, the correct answer is option [3] 8.96 g/cm³

  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-