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11) Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium are needed to produce 0.45 mol of N when the reaction is carried out in the presence of excess nitrogen? A) 0.23 B) 1.4 C) 0.15 D) 0.30 E) 2.7 12) Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many moles of are produced by the decomposition of 1.25 mol of sodium azide? A) 0.833 B) 3.75 C) 1.88 D) 0.417 E) 0.625 13) Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s) + (g) → 2MgO(s) How many moles of are consumed when 1.90 mol of magnesium burns? A) 0.0782 B) 1.05 C) 1.90 D) 3.80 E) 0.950 14) Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many grams of sodium azide are required to produce 25.0 g of nitrogen? A) 1.34 B) 0.595 C) 58.0 D) 38.7 E) 87.0 15) How many moles of CuO can be produced from 2.25 mol of Cu2O in the following reaction? 2 Cu2O(s) + O2(g) → 4 CuO(s) A) 1.12 mol B) 2.25 mol C) 4.50 mol D) 9.00 mol 16) How many moles of BCl3 are needed to produce 5.00 g of HCl(aq) in the following reaction? BCl3(g) + 3 H2O(l) → 3 HCl(aq) + B(OH)3(aq) A) 0.0457 mol B) 0.137 mol C) 0.411 mol D) 21.9 mol 17) How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl2(aq) + K2CO3(aq) → 2 KCl(aq) + CaCO3(aq) A) 0.269 g B) 3.72 g C) 7.44 g D) 14.9 g 18) Balance the chemical equation given below, and determine the number of moles of iodine that reacts with 20.0 g of aluminum. ________ Al(s) + ________ I2(s) → ________ Al2I6(s) A) 0.494 mol B) 1.11 mol C) 1.48 mol D) 2.22 mol 19) Balance the chemical equation given below, and determine the number of grams of MgO are needed to produce 15.0 g of Fe2O3. ________ MgO(s) + ________ Fe(s) → ________ Fe2O3(s) + ________ Mg(s) A) 0.0877 g B) 1.26 g C) 3.78 g D) 11.4 g 20) Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas. How many grams of oxygen are formed when 20.0 g of dinitrogen monoxide decomposes? A) 0.138 g B) 7.27 g C) 14.5 g D) 29.1 g

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