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Sedaia [141]
3 years ago
11

Barium metal has a body-centered cubic lattice with all atoms at lattice points; its density is 3.51 g/cm3. From these data and

the atomic weight, calculate the edge length of a unit cell.
Biology
1 answer:
stiks02 [169]3 years ago
7 0

Answer:

The unit cell's edge length is 5.06\times 10^{-8} m

Explanation:

Number of atom in BCC unit cell = Z = 2

Density of barium metal= 3.51g/cm^3

Edge length of cubic unit cell= a  = ?

Atomic mass of Ba(M) = 137.33 g/mol

Formula used :  

\rho=\frac{Z\times M}{N_{A}\times a^{3}}

where,

= density

Z = number of atom in unit cell

M = atomic mass

(N_{A}) = Avogadro's number  

a = edge length of unit cell

On substituting all the given values , we will get the value of 'a'.

3.51 g/cm3=\frac{2\times 137.33g/mol}{6.022\times 10^{23} mol^{-1}\times (a)^{3}}

a = 5.06\times 10^{-8} m

The unit cell's edge length is 5.06\times 10^{-8} m

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Answer:

The right answer is D: realize that the term heavy describes an object one way and the term big describes it another way.

Explanation:

The studies of Piaget suggested that when a child is born, his brain if of a very basic kind of structure. He did not agree with the idea that intelligence is a pre-determined trait and in contrast he said that during the process of child's growth and development, when the interaction with environment occurs, his cognitive abilities also grow.

When the child is able to realize that term heavy describes an object one way and the term big describes it another way, that is the point when , children have acquired the cognitive skill of conservation.

Hope it help!


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