Fe_2O_3(s) and powdered aluminum can react with great output of heat to form mol
ID: 1010555 • Letter: F
Question
Fe_2O_3(s) and powdered aluminum can react with great output of heat to form molten iron and Al_2O_3. When this reaction equation is balanced, what are the stoichiometric coefficients in the following order; 1, 1, 1, 1 2, 2, 2, 2 1, 2, 2, 1 2, 1, 1, 2 1, 1, 2, 2 Air bags in cars inflate when an electrical spark activates sodium azide (NaN_3), so that it decomposes to sodium metal and nitrogen gas. In the balanced reaction equation, how many moles of N_2 gas are formed for each mole of NaN_3? 1 1.5 2 3 2.5 Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain. What is the product when one molecule of SO_2 reacts with one molecule of water? two molecules of sulfurous acid one sulfate ion two sulfite ions one molecule of sulfuric acid one molecule of sulfurous acid The acid-base reaction between phosphoric acid, H_3PO_4, and calcium hydroxide, Ca(OH)_2, yields water and calcium phosphate. For each mole of calcium phosphate produced by this reaction, how many moles of water are produced? 1 2 3 4 6 One form of elemental sulfur u a ring of eight sulfur atoms. How many moles of molecular oxygen are consumed when one mole of this allotrope burns to make sulfur trioxide? 3 6 12 18 24 In an aqueous solution under basic conditions, ozone (O_3) reacts with iodide (1^-) and water to form iodine (l_2). hydroxide (OH^-), and oxygen (O_2). What is the sum of the stoichiometric coefficients in the balanced reaction equation? O_3(g) + 1^-(aq) + H_2O(l) rightarrow 1_2(aq) + OH^-(aq) + O_2(g) 6 8 10 12 14 Sulfuric acid reacts with a vanadium oxide compound according to the following unbalanced reaction. What are the coefficients in the balanced chemical equation in the order in which it is written? H_2SO_4(aq) + V_2O_3(s) rightarrow V_2(SO_4)_3(s) + H_2O(l) 3, 1, 1, 3 3, 2, 3, 3 3, 1, 1, 6 3, 2, 2, 6 6, 3, 3, 12Explanation / Answer
32. Fe2O3 + 2 Al ----> Al2O3 + 2 Fe
Fe2O3 , Al, Fe, Al2O3 = 1,2,2,1
33. 2 NaN3 = 2 Na + 3 N2
moles of N2 gas formed = 3
34. SO2 + H2O -----> H2SO3
one molecule of Sulfurous acid.
35. 2 H3PO4 + 3 Ca(OH)2 -----> Ca3(PO4)2 + 6 H2O
moles of water = 6
36. S8 + 12 O2 = 8 SO3
moles of oxygen = 12
37. O3 + 2 I- + 1 H2O -----> I2 + 2 OH- + O2
sum of coefficients = 1+2+1+1+2+1 = 8
38. 3 H2SO4 + V2O3 ----> V2(SO4)3 + 3 H2O
coefficients = 3, 1, 1, 3
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