chemical engineering......you can skip otherwise devoted very much

[1]- An alloy of silicon and iron (Si-Fe) has 0.25 wt% of Si. If the density and atomic weight are 2.33g cm3 and 28 g mol for silicon and 7.87 g cm3 and 55.85 g mol for iron, calculate: a) Atomic percentage of silicon and iron. b) Density of iron in the alloy ( kg m3). c) Average atomic weight of the alloy ( g mol ). d) Number of moles of silicon and iron