Write the value of Avogadro's number.

Calculate the value of Avogadro's number from the following data Density of NaCl=2.165"g cm"^(-3) . Distance between Na^(+)andCl^(-) in NaCl crystal = 281 pm.

By X-ray diffraction it is found tht nickel ("at mass"=59g "mol"^(-1)) , crystallizes with ccp. The edge length of the unit cell is 3.5 Å . If density of Ni crystal is 9.0g//cm^(3) , then value of Avogadro's number from the data is:

Estimate the average mass density of a sodium atom assuming its size to be about 2.5 overset@A . (Use the known values of Avogadro’s number and the atomic mass of sodium). Compare it with the density of sodium in its crystalline phase : 970 kg m^-3 . Are the two densities of the same order of magnitude ? If so, why ?

Write the RQ value of Fats

Iron has a body centred cubic unit cell with the cell dimension of 286.65 pm. Density of iron ·is 7.87 g cm^(-3) Use this information to calculate Avogadro's number. (Atomic mass of Fe= 56.0 u)

Write the RQ value of Proteins

Write the RQ value of Glucose

Explain the term Avogadro's number and mention some methods for determination of Avogadro's number. What is significance of Avogadro's number?

Estimate the number of free electrons in 1 g of water and the negative charge possessed by the. Given that Avogadro number = 6.02 xx 10^23 and molecular weight of water = 18