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What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.0%) and one with mass = 65.32 amu? a. 65.3 amu b. 64.4 amu c. 64.9 amu d. 65.0 amu e. 64.8 amu
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What is the formula weight of ammonium oxide? a. 44.0 g/mol b. 52.1 g/mol c. 34.0 g/mol d. 30.0 g/mol
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Stoichiometry
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Santiago Delgado owns a copier store. He leases two copy machines for which he pays $20 each per day. He cannot increase the number of machines he leases without giving the office machine company six weeks’ notice. He can hire as many workers as he wants,
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Carbonic acid can form water and carbon dioxide upon heating. How much carbon dioxide is formed from 14.80 grams of carbonic acid? H2CO3 arrow H2O + CO2
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Assume the LIBOR rate is the same as the Treasury yield curve in Exhibit 1. What is the current price of the LIBOR floating rate bond that pays its coupon according to 6 month LIBOR rate, par value $1
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Stoichiometry
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Which of the following correctly describes the values of % AE and the E-factor for the reaction below? (% AE = percent atom economy; E-factor = environmental factor) 2 Fe + 3 Cl2 rightarrow 2 FeCl3 a) % AE = 100; E-factor greater than 0 b) % AE less tha
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C3H8O (glycerol) + CH3COCl (acetyl chloride) = C9H14O6 (triacetyl glycerol) + HCl 3.68 mL of glycerol reacted with 9.4 grams of acetyl chloride to produce 5.0 mL of triacetyl glycerol glycerol MW = 92 g/mol, density = 1.25 g/mL acetyl chloride MW = 78.5 g
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Titanium is a strong, lightweight, corrosion-resistant metal that is used in rockets, jet engines, and bicycle grams. It is prepared by the reaction of titanium (IV) chloride with molten magnesium between 950 and 1150 degrees C via the following reaction:
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Stoichiometry
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What are the steps you would take in preparing 500 mL of a 1.5N HCl solution?
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Stoichiometry
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What will be the theoretical yield of tungsten(s), W, if 45.0 g of WO_3 combines as completely as possible with 1.50 g of H_2? WO_3(s) + 3H_2(g) rightarrow W(s) + 3 H_2O(g)
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Naturally occurring iodine has an atomic mass of 126.9045 amu. A 12.3849 g sample of iodine is accidentally contaminated with an additional 1.00070 g of 129I, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid glan
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Naturally occurring ‘Element X’ exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance). X-29 (28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). Calculate the atomic we
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How many moles of H are in 1.60 moles of H3PO4?
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The element copper has an atomic weight of 63.5 and consists of two stable isotopes copper-63 and copper-65. The isotope copper-63 has an atomic mass of 62.9 amu and a percent natural abundance of 69.1%. The isotope copper-65 has a percent natural abundan
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