Will mark empirical formula for a compound is the radio of the atoms or moles of the elements in a compound

Empirical formula is the lowest whole number ratio of the atoms or moles of the elements in a compound.

Explanation:

Empirical formula:

It is the simplest formula gives lowest whole number ratio of the atoms or moles of the elements in a compound.

For example:

The empirical formula of glucose ( C₆H₁₂O₆) is CH₂O.

The empirical formula of benzene (C₆H₆)  is CH.

Consider  the following example:

The mass of sodium in a compound is 29 g, sulfur is 40.5 g and oxygen is 30.5 g. The empirical formula will be:

Solution:

Number of gram atoms of Na = 29.0/23 =1.261

Number of gram atoms of S = 40.5 / 32 = 1.266

Number of gram atoms of O = 30.5 / 16 = 1.906

Atomic ratio:

Na               :            S                  :    O

1.261/1.261 :       1.266/1.261     :   1.906/1.261

     1          :            1                    :         1.5

Na : S : O = 2  ( 1: 1 : 1.5)

Na : S : O = 2 : 2 : 3

Empirical formula is  Na₂S₂O₃.

answer; ///i do believe that the correct answer is (b); ///particle composed of two or more atoms bonded together;

  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-