The density of zinc is 7.14 g/cm^3 and has an atomic radius of 1.332a. calculate the height of its unit cell. the atomic weight is 65.37 grams/mole.

Answer : The height of the unit cell is,

Explanation : Given,

Density of zinc =

Atomic radius =

Atomic weight of zinc = 65.37 g/mole

As we know that, zinc has haxagonal close packed crystal structure. The number of atoms in unit cell of HCP is, 6.

Formula used for density :

     .............(1)

where,

= density  of zinc

Z = number of atom in unit cell  = 6 atoms/unit cell (for HCP)

M = atomic mass

= Avogadro's number  =

a = edge length of unit cell

= volume of unit cell

Now put all the values in above formula (1), we get

Now we have to calculate the height of the unit cell.

Formula used :

where,

V = volume of unit cell

r = atomic radius =

conversion used :

h = height of the unit cell

Now put all the given values in this formula, we get:

Therefore, the height of the unit cell is,

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

i need with 1.3.2 investigate cycling o2 and co2 apex

we need to see it