11) How many grams are in 0.02 moles of beryllium iodide, BeI_(2) 12) How many moles are in 68 grams of copper (II) hydroxide, Cu(OH)_(2) 13) How many grams are in 3.3 moles of potassium sulfide. K_(2)S 14)How many moles are in 1.2times 10^3 grams of ammonia, NH_(3) 15) How many grams are in 2.3times 10^-4 moles of calcium phosphate, Ca_(3)(PO_(3))_(2) 16) How many moles are in 3.4times 10^-7 grams of silicon dioxide, SiO_(2)

11) To find the number of grams in 0.02 moles of beryllium iodide ( ), we need to calculate the molar mass of first.The molar mass of is calculated as follows:- Beryllium (Be): 9.01 g/mol- Iodine (I): 126.90 g/molMolar mass of = 9.01 g/mol + 2(126.90 g/mol) = 262.81 g/molNow, we can calculate the number of grams in 0.02 moles of :Number of grams = Molar mass × Number of molesNumber of grams = 262.81 g/mol × 0.02 moles = 5.2562 gramsTherefore, there are approximately 5.2562 grams in 0.02 moles of beryllium iodide ( ).12) To find the number of moles in 68 grams of copper (II) hydroxide ( ), we need to calculate the molar mass of first.The molar mass of is calculated as follows:- Copper (Cu): 63.55 g/mol- Oxygen (O): 16.00 g/mol- Hydrogen (H): 1.01 g/molMolar mass of = 63.55 g/mol + 2(16.00 g/mol + 1.01 g/mol) = 97.57 g/molNow, we can calculate the number of moles in 68 grams of :Number of moles = Mass / Molar massNumber of moles = 68 grams / 97.57 g/mol = 0.698 molesTherefore, there are approximately 0.698 moles in 68 grams of copper (II) hydroxide ( ).13) To find the number of grams in 3.3 moles of potassium sulfide ( ), we need to calculate the molar mass of first.The molar mass of is calculated as follows:- Potassium (K): 39.10 g/mol- Sulfur (S): 32.07 g/molMolar mass of = 2(39.10 g/mol) + 32.07 g/mol = 110.27 g/molNow, we can calculate the number of grams in 3.3 moles of :Number of grams = Molar mass × Number of molesNumber of grams = 110.27 g/mol × 3.3 moles = 364.89 gramsTherefore, there are approximately 364.89 grams in 3.3 moles of potassium sulfide ( ).14) To find the number of moles in grams of ammonia ( ), we need to calculate the molar mass of first.The molar mass of is calculated as follows:- Nitrogen (N): 14.01 g/mol- Hydrogen (H): 1.01 g/molMolar mass of = 14.01 g/mol + 3(1.01 g/mol) = 17.04 g/molNow, we can calculate the number of moles in grams of :Number of moles = Mass / Molar massNumber of moles = grams / 17.04 g/mol = 70.59 molesTherefore, there are approximately 70.59 moles in grams of ammonia ( ).15) To find the number of grams in moles of calcium phosphate ( ), we need to calculate the molar mass of first.The molar mass of is calculated as follows:- Calcium (Ca): 40.08 g/mol- Phosphorus (P): 30.97 g/mol- Oxygen (O): 16.00 g/molMolar mass