Where does uranium, the main source of nuclear power, come from? a. Uranium is produced by mining deposits of this mineral found in Earth’s crust.

b. Uranium is produced continually from light energy from the Sun.

c. Uranium is produced by the compaction of animal and plant matter in the earth.

d. Uranium is produced by the conversion of precious metals into a new substance.

Uranium is produced by mining deposits of this mineral found in earth's crust

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

i just learnt this recently but i need to look through my notes again