Q1. (a) Calculate the number of atoms of iron in 50 g of iron (relative atomic m

Question

Q1. (a) Calculate the number of atoms of iron in 50 g of iron (relative atomic mass (55.8)
(b) Estimate the volume occupied by an iron atom, given that the density of iron is 7.87 g cm-3.
Q2. An oil droplet with a diameter of 0.28 mm spreads out into a circular patch of diameter 28 cm.
Calculate the thickness of the oil patch.
Q3. Calculate the theoretical density of chromium given that it has a body-centredcubic structure with a lattice constant of 289 pm. The molar mass of chromium is 52.0 g mol-1.

Explanation / Answer

Q1. (a) Calculate the number of atoms of iron in 50 g of iron (relative atomic mass=55.8) atomic mass of Fe = 55.8 1 mole of atoms = 6.02 x 10^23 atoms 1 mole of Fe = 55.8 g 50 g of Fe = 50/55.8 = 0.896 mole number of Fe atoms in 0.896 mole = 0.896*6.02 x 10^23 atoms = 5.39 x 10^23 atoms of Fe

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