please answer all questions

4. The half-life of radium- 226 is 1.6103 years 6 marks a. Calculate kins1 b. What is the activity in curies of a 1.00g sample of Ra226 c. What is the mass in grams of a sample of Ra-226 that has an activity of 1109 atoms /min ? 5. For the radioactive decay of radium, +, Calculate DE in kJ when 10.2g of radium decays. 4 marks 6. Calculate DE, in kJ per gram of reactants in a fusion reaction, + (B) 4 marks. 7. Given the mass (amu) of Li-6 nuclei, neutron, and proton to be 6.01348,1.00867, and 1.00728g, respectively, calculate the binding energy: i) per mole of Li6 ii) per mole of nuclear particles (nucleons) 8. Explain why the naturally occurring uranium can be used in heavy water power plants but not in light water power plants. 9. Applying excess fertilizers more than what plants need is disadvantageous to farmers in terms of cost and to the environment in terms of soil/water pollution. Using knowledge from Part I of CHEM 404 notes, describe how nuclear chemistry can be used to maximize crop yield with fertilizers without applying excess fertilizers. 20 marks