Determine the number of atoms in a sample of nickel that has a mass of 8.30 × 10−12 g

There are 8.4 × 10¹⁰ atoms in the given sample of Nickel.

Explanation:

To find the number of atoms in the given mass of Nickel, first we have to find the number of moles using its mass and molar mass of nickel then multiply the moles by the Avogadro's number so that we will get the number of atoms in that sample of nickel.

Moles of Nickel =  

                   =

                  = 1.4 × 10⁻¹³ moles

Now we have to multiply the number of moles by Avogadro's number, we will get the number of atoms of Nickel.

Number of atoms = 1.4 × 10⁻¹³× 6.022 × 10²³

                             = 8.4 × 10¹⁰ atoms of Nickel

yes

explanation:

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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-