Estimate the averaage atomic mass density of a sodium atom, assuming its size ot be 2.5 Å. Compare it with density of sodium in its crystalline phase `(970 kg m^(-3))`. Are the two denities of the same order of magnitude ? If so, why ?

Which of the following is the average mass density of sodium atom assuming, its size to be about 2.5Å (use the known values off Avogadro's number and the atomic mass of sodium)

Mass of an atom of Uranium is 3.7xx10^(-25) kg. What will be its value in order of magnitude?

What is molality of 1 M solution of sodium nitrate if its density is 1.25 "g cm"^(-3) ?

Two kg of a monoatomic gas is at a pressure of 4 xx 10^(4) N//m^(2) . The density of the gas is 8 kg//m^(3) . What is the order of energy of the gas due to its thermal motion ?

Diameter of a planet is 10d_(@) , its mean density is (rho_(@))/(4) and mass of its atmosphere is 10m_(@) where d^(@) , rho^(@) and m^(@) are diameter, mean density and mass of atmosphere respectively for the earth. Assume that mean density of atmosphere is same on the planet and the earth and height of atmosphere on both the planets is very small compared to their radius. Find the ratio of atmospheric pressure on the surface of the planet to that on the earth. If a mercury barometer reads 76 cm on the surface of the earth, find its reading on the surface of the planet.

The unit cell of Na is bcc and its density is 0.97 g/c m^(3) . What is the radius of a sodium atom if the molar mass of Na is 23 g/mol?

The pyknometric density of sodium chloride crystal is 2.165xx10^(3)kg m^(-3) while its X ray density is 2.178xx10^(3)kg m^(-3) the fraction of unoccupied sites in NaCl crystal is