Question 4
1 pts
How many moles of chromium are 1.5 x 10^24 atoms?

Using N = n × L

L = Avogadro's constant =6.02 ×10^23

n = number of moles

N = Number of entities

N = 1.5 × 10^24

n = N /L

n = 1.5×10^24/6.02×10^23

n = 2.49 moles

Hope this helps.

  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-

all eukaryotic cell have mitochondria : )