Which has more number of atoms 100 g of sodium or 100 g of iron? Justify your answer. Atomic mass of sodium =23 u, atomic mass of iron= 56 u)

Atomic mass of Sodium is-

48 g of Mg contains the same number of atoms as 160 g of another element . The atomic mass of the element is

A vessel contains two non reactive gases : neon (monatomic) and oxygen (diatomic). The ratio of their partial pressures is 3:2. Estimate the ratio of (i) number of molecules and (ii) mass density of neon and oxygen in the vessel. Atomic mass of Ne= 20.2 u, molecular mass of O_(2) = 32.0 u .

The amount of iron (Fe) in g which can be produced from 600g of magnetite ore is [Atomic mass of Fe : 55.8]

Molecular mass of HNO_3 (Atomic masses of H=1U, N=14U, O=16U)-

Number of atoms of iron present in 100 gm Fe_(2)O_(3) having 20% purity is

Calculate the volume, mass and number of molecules of hydrogen liberated when 230 g of sodium reacts with excess of water at STP (atomic masses of Na = 23U, O = 16 U and H = 1U).

A domain in ferromagnetic iron is in the form of a cube of side length 1 mu m . Estimate the number of iron atoms in the domain and the maximum possible dipole moment and magnetisation of the domain. The molecular mass of iron 55g/mole and is density is 7.9 g//cm^(3) . Assume that each iron atom has a dipole moment of 9.27 xx 10^(-24) A m^(2) .