Question

how many moles are there in 6.023×10^20 atoms of calcium ?​

Answer 1

Answer:

In

1

m

o

l

of

C

a

atoms

, there are

N

A

individual calcium atoms.

Explanation:

How does this help you? Well, it happens that

N

A

,

Avogadro's Number

≅

6.022

×

10

23

⋅

m

o

l

−

1

.

And it is stated on your trusty Periodic Table that the molar mass of

C

a

is

40.08

⋅

g

⋅

m

o

l

−

1

. So, if we specify a molar quantity, we specify a precise number of atoms and molecules that can be approximated by mass.