Iron crystallizes in a body-centered cubic unit cell. the edge length of this cell is 287 pm. calculate the density of iron in g/ml.

Density = 7.87 grams per mL

Explanation:

Density is given by the formula:

where

Z = effective number of atoms in one unit cell.

M = Molecular mass of the substance

a = edge length of unit cell

Na = Avogadro number = 6.022×10²³

In this case:

Z=2 as it is body-centered type unit cell

M = 56 g per mole for iron

a =  287 pm =

Substituting the above values in the density formula we get:

Density of iron is 7.87 grams per mL.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: