(c) 215Po84 4He2  → 25. Write a balanced nuclear equation for each of the following. (a) Radon-233 decays with the emission of an alpha particle. (b) Actinium-228 decays with the emission of a beta particle. 26. Complete and balance each of the following nuclear equations. (a) 23Na11 23Mg12  1n0 → (b) 96Mo42 100Tc43 4He2  → 29Si14 (c) 1H1 0λ0 → (d) 209Bi83 210Po84  1n0 → UNIT 2 Chapter 5 27. Gallium exists as two isotopes, Ga-69 and Ga-71. (a) How many protons and neutrons are in each isotope? (b) If Ga-69 exists in 60.0relative abundance, estimate the average atomic mass of gallium using the mass numbers of the isotopes. Rubidium exists as two isotopes: Rb-85 has a mass of 84.9117 u and Rb-87 has a mass of 28. 86.9085 u. If the average atomic mass of rubidium is 85.4678, determine the relative abundance of each isotope. 29. Calculate the mass of each of the following compounds. (a) Al2(CrO4)3 (b) C4H9SiCl3 (n-butyltrichlorosilane, an intermediate in the synthesis of silicones) (c) Cd(ClO3)2 2H2O (cadmium chlorate dihydrate, an oxidizing agent) 30. How many are contained in 3.49 moles of manganese? 31. How many atoms are there in 8.56 g of sodium? 32. What is the mass of 5.67 x1023 molecules of pentane, C5H12? 33. Consider a 23.9 g sample of ammonium carbonate, (NH4)2CO3. (a) How many moles are in this sample?
(c) 215Po84 → 4He2  25. Write a balanced nuclear equation for each of the following. (a) Radon-233 decays with the emission of an alpha particle. (b) Actinium-228 decays with the emission of a beta particle. 26. Complete and balance each of the following nuclear equations. (a) 23Na11  → 23Mg12 1n0 (b) 96Mo42 4He2 → 100Tc43  (c) 1H1 → 29Si14 0λ0 (d) 209Bi83  → 210Po84 1n0 UNIT 2 Chapter 5 27. Gallium exists as two isotopes, Ga-69 and Ga-71. (a) How many protons and neutrons are in each isotope? (b) If Ga-69 exists in 60.0relative abundance, estimate the average atomic mass of gallium using the mass numbers of the isotopes. 28. Rubidium exists as two isotopes: Rb-85 has a mass of 84.9117 u and Rb-87 has a mass of 86.9085 u. If the average atomic mass of rubidium is 85.4678, determine the relative abundance of each isotope. 29. Calculate the mass of each of the following compounds. (a) Al2(CrO4)3 (b) C4H9SiCl3 (n-butyltrichlorosilane, an intermediate in the synthesis of silicones) (c) Cd(ClO3)2 2H2O (cadmium chlorate dihydrate, an oxidizing agent) 30. How many are contained in 3.49 moles of manganese? 31. How many atoms are there in 8.56 g of sodium? 32. What is the mass of 5.67 x1023 molecules of pentane, C5H12? 33. Consider a 23.9 g sample of ammonium carbonate, (NH4)2CO3. (a) How many moles are in this sample?