Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 8.10 mg sample would be left after 58.8 days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 x10 X μ olo

if a particle has a mass 5.7661x10^-28 kg, what would its mass be in amu?

The radius of a tantalum atom is 142 pm. How many tantalum atoms would have to be laid side by side to span a distance of 1.87 mm? atoms

On the following page, you will find the IR, 13C-NMR and ¹H-NMR for C6H12O. Determine the structure of the molecule. As you solve the structure, keep the following questions in mind: • What is the index of hydrogen deficiency for this formula? • Using the IR, what functional group(s) is (are) present in the molecule? What functional groups are missing? At what chemical shift range should look for corresponding peaks in the CNMR? In the HNMR? Are there peaks in those regions? • How many peaks are in the carbon NMR spectrum? How does it compare to the chemical formula? What might this tell you about the molecule? • How many peaks are in the proton NMR spectrum? How does it compare to the chemical formula? What might this tell you about the molecule? .

number of protons number of neutrons 59Ni+3 number of electrons number of nucleons

How many protons, neutrons, and electrons are present in 108 47X ?

The number of atoms in 1 mg of radium is 2.66 x 10^18 calculate the number of radium atoms from that sample remaining in 2023 (125 years later)