Which polyatomic ion contains the greatest number of oxygen atoms?
(1) acetate (3) hydroxide
(2) carbonate (4) peroxide

The correct answer is option 2, that is, carbonate.

Explanation:

A molecular ion, also known as a polyatomic ion, refers to a charged chemical ion or species comprising two or more atoms that are combined covalently, or of a complex of a metal, which can be regarded to be functioning as a single unit.  

Of the given options, acetate has two atoms of oxygen, carbonate has three oxygen atoms, hydroxide has one, and peroxide has two atoms of oxygen. Thus, carbonate has the highest number of oxygen atoms.  

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.