Answer:
2x(6
Explanation:
A molecular compound is represented by a compound of atoms combining to together
Answer:
The approximate age of the igneous rock is
years.
Explanation:
Chemically speaking, the Uranium-235 decays to form Lead-207 throughout time. All isotopes decay exponentially by means of the following model:
(1)
In addition, we can determine the time constant of the former isotope in terms of its half life, that is:
(2)
Where:
- Initial mass of Uranium-235, in atoms.
- Current mass of Uranium-235, in atoms.
- TIme constant, in years.
- Half-life of Uranium-235, in years.
Please remind that a 1 : 1 ratio of Uranium-235 to Lead-207 atoms means that current mass of Uranium-235 is a half of its initial mass. If we know that
and
, then the approximate age of the igneous rock is:





The approximate age of the igneous rock is
years.
I think it would be c b then a