Question

Given that a kg of copper contains about 10.25 atoms and that density of copper is about 9000 kilograms per cubic metre a estimate the diameter of a copper atom b step the assumption made in 9 above

Answer 1

Explanation:

density=

volume

mass

molar mass

density

=

atomic mass

mass

×

volume

1

=

volume

no. of moles

⟹

v

n

=

63.5

9×10

3

kgm

−3

In 1 m

3

, ⟹n=

63.5

9×10

3

kg=141.73×10

3

moles

No. of Cu atoms=141.73×10

3

×6.023×10

23

=8.53×10

28

As 1 Cu atom provides 1 free electron.

Thus, no. of free electrons=8.53×10

28

≃10

29

ITS A QUESTION WITH DIFFERENT VALUES BUT DAMMM SIMILAR SO SEE THE SOLUTION AND TAKE OUT YOUR REQUIRED ANSWERS