Question

the mass of a single tantalum atom is 3.01x10^-22 grams. how many tantalum atoms would there be in 119 milligrams of tantalum?

Answer 1

7.51

×

10

24

The density

ρ

of a sample is its ratio of mass

m

to volume

V

:

ρ

=

m

V

.

To find the number of atoms in this sample, first multiply the volume by the density to get the mass. Then divide this mass by the mass of one atom.

133

c

m

3

T

a

(

17.0

g

1

c

m

3

)

(

1

atom

T

a

3.01

×

10

−

22

g

T

a

)

=

7.51

×

10

24

Ta atoms