Question

A balanced chemical equation contains the term "2Ba(OH)2⋅8H2O." How many atoms of each element does this represent in the molecular view?BaOHb) How many moles of each element does this represent on the laboratory scale?BaOH

Answer 1

a. According to the given formula, to find the number of atoms of each element we have to take into account the coefficients and subscripts of the molecule.

There are 2 molecules of Ba(OH)2*8H2O.

In one molecule there is one Barium atom, 10 oxygen atoms (2 from the hydroxide and 8 from the water) and 18 hydrogen atoms (2 from the hydroxide and 16 from the water).

Since there are 2 molecules, we have to multiply all the numbers of atoms of each elements to determine the final answer:

Ba: 2 atoms.

O: 20 atoms

H: 36 atoms.

b. Using Avogadro's number we can find the number of moles that each number of atoms represent for each element:

`Ba\to2mol\cdot(6.023*10^(23)atoms)/(mol)=3.32*10^(-24)atoms`
`O\to20mol\cdot(6.023*10^(23)atoms)/(mol)=3.32*10^(-23)atoms`

`H\to36mol\cdot(6.023*10^(23)atoms)/(mol)=5.98*10^(-23)atoms`