Question

. How many moles of Barium Chloride are made by 18.066 x 1021 molecules of the same

Answer 1

Explanation:

Clearly there are

3

moles

of atoms in one mole of

B

a

C

l

2

.

Explanation:

If I asked how many atoms there were in a dozen formula units of

B

a

C

l

2

, I think you would quickly answer 3 dozen: 12 barium atoms, and 24 chlorine atoms.

The question specified molar quantities, and the mole is just another number, admittedly a very large number, i.e.

N

A

=

6.022

×

10

23

m

o

l

−

1

.

So in

1

mole of

B

a

C

l

2

, there are

3

×

N

A

barium and chlorine atoms, where

N

A

is Avogadro's number,

6.022

×

10

23

.