A student has a canister full of 45 marbles. There are two types of marbles in the canister. Some of them have a mass of 4.50 g (type A) and the other type has a mass of 3.27 g (type B). The mass of the marbles, including the canister is 201.27 g. The mass of the canister is 14.76 g. Calculate the number of A and B marbles in the canister.

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  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-

a polar bond is formed when electrons are shared unevenly between atoms