Abottle is labeled as 2.5 m ca(oh)2. what is the concentration of ca2+?

2.5 mol·L⁻¹  

Explanation:

                        Ca(OH)₂(aq) ⟶ Ca²⁺(aq) + 2OH⁻(aq)

I/mol·L⁻¹ :               2.5                    0                    0

C/mol·L⁻¹:              -2.5                 +2.5               +5.0

F/mol·L⁻¹:                 0                    2.5                 5.0

Ca(OH)₂ is a strong electrolyte. It dissociates completely in solution to form ions

Initial

Assume you dissolve 2.5 mol of Ca(OH)₂ in enough water to make 1 L of solution.

In the instant before it dissociates, you have a 2.5 mol·L⁻¹ solution of Ca(OH)₂ and no Ca²⁺ ions.

Change

The Ca(OH)₂ is dissociates completely into ions. You lose 2.5 mol of Ca(OH)₂ and form 2.5 mol of Ca²⁺.

Final

You end up with no formula units of Ca(OH)₂ and 2.5 mol of Ca²⁺.

answer: they produce more slow than unicellular organisms.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.