Since you have stated that the uranium is pure, it is therefore all uranium and contains no lead; lead is not uranium.
1 kg uranium 235 = 3 000 t coal
there is not uranium in the sun. the nuclear fusion is due to hydrogen that fuses to helium
Cca. 50 kg of highly enriched uranium. Now nuclear bombs use plutonium, not uranium.
The known reserves uf uranium in Australia are now approx. 1 700 00o t.
7 g of 235U is equivalent to approx. 20 t coal. For 1 kg of 235U - approx. 3 000 t coal.
lead has much higher density
Not much, 1Kg is subcritical.
1 kilogram of lead is worth about one dollar for every kilogram. Lead is very abundant and not worth very much.
12.5 %
Less and less as the Uranium decays into lead and other elements.... More and more as super-novae explode and fuse elements into Uranium...
Approx. 120 $ for 1 kilogram of unrefined oxide U3O8 (July 2011)
Uranium is a solid, not a liquid. So it is sold by weight, not by volume. As of 25 July 2011 Uranium costs US $ 51.50per US pound or US $113 per kilogram of natural uranium in the form of the unrefined uranium oxide (U3O8).
Yes
That depends on the substance that the kilogram is made of. A kilogram of air has a large volume. A kilogram of water has a medium volume. A kilogram of lead or stones has a small volume.
Because of its' mass density. The lead would be much smaller in size.
About 1500 tons of coal
1 kg of 235U = 3 000 t coal