What is the answer to this problem

380.5g/mol

Explanation:

The molar mass of a compound can be obtained by adding the molar masses of the elements present in the compound.

The molar mass of Cu3(PO4)2 can be obtained as follow:

Molar Mass of Cu = 63.5g/mol

Molar Mass of P = 31g/mol

Molar Mass of O = 16g/mol

The molar mass of Cu3(PO4)2 = (63.5x3) + 2[31 + (16x4)] = 190.5 + 2[31 + 64] = 190.5 + 2[95] = 190.5 + 190 = 380.5g/mol

  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-