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C12H22011(S) Exercises c. + 02(g) CO2(g) d. Fe(s) + 02(g) Fe203(S) 123 e. FeO(s) -* + 02(g) -* F~03(S) -* + H20(g) 96. Balance the following equations: a. Cr(s) + Ss(s) Cr2S3(S) -* b. NaHC03(s) ~ Na2C03(S) + CO2 (g) + HP(g) In this equation, the 8H20 in Ba(OH)z . 8H20 indicates the presence of eight water molecules. This compound is called barium hydroxide octahydrate. a. Balance the equation. b. What mass of ammonium thiocyanate (NH4SCN) must be used if it is to react completely with 6.5 g barium hydroxide octahydrate? 103. Elixirs such as Alka-Seltzer use the reaction of sodium bicarbonate with citric acid in aqueous solution to produce a fizz: c. KCI03(s) Heat) KCI(s) + 02(g) d. Eu(s) + HF(g) EuF3(s) + Hig) -* 97. Silicon is produced for the chemical and electronics industries by the following reactions. Give the balanced equation for each reaction. a. Si02(s) 3NaHC03(aq) + C6HsOiaq) ~ 3C02(g) + 3H20(l) + Na3C6Hs07(aq) + C(s) a:ll~~::~:/ Si(s) -* Si(s) + CO(g) b. Silicon tetrachloride is reacted with very pure magnesium, producing silicon and magnesium chloride. a. What mass of C6Hs07 should be used for every 1.0 X 102 mg NaHC03? b. What mass of CO2(g) could be produced from such a mixture? 104. Phosphorus can be prepared from calcium phosphate by the following reaction: c. Na2SiF6(s) + Na(s) + NaF(s) 98. Glass is a mixture of several compounds, but a major constituent of most glass is calcium silicate, CaSi03. Glass can be etched by treatment with hydrofluoric acid; HF attacks the calcium silicate of the glass, producing gaseous and water-soluble products (which can be removed by washing the glass). For example, the volumetric glassware in chemistry laboratories is often graduated by using this process. Balance the following equation for the reaction of hydrofluoric acid with calcium silicate. 2Ca3(P04Ms) + 6Si02(s) + IOC(s) ~ 6CaSi03(s) + P4(s) + IOCO(g) Phosphorite is a mineral that contains Ca3(P04)2 phosphorus-containing compounds. What is amount of P4 that can be produced from 1.0 kg if the phorphorite sample is 75% Ca3(P04)2 by an excess of the other reactants. Coke 105. is an impure dustrial production coke is 95% carbon to react completely plus other nonthe maximum of phosphorite mass? Assume Reaction Stoichiometry 99. Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid-fuel rocket motors. The reaction is form of carbon that is often used in the inof metals from their oxides. If a sample of by mass, determine the mass of coke needed with 1.0 ton of copper(II) oxide. 2CuO(s) + C(s) ~ 2Cu(s) + CO2(g) What masses of iron(Ill) oxide and aluminum must be used to produce 15.0 g iron? What is the maximum mass of aluminum oxide that could be produced? 100. The reaction between potassium chlorate and red phosphorus takes place when you strike a match on a matchbox. If you were to react 52.9 g of potassium chlorate (KCI03) with excess red phosphorus, what mass of tetraphosphorus decaoxide (P40IO) would be produced? 106. The space shuttle environmental control system handles excess CO2 (which the astronauts breathe out; it is 4.0% by mass of exhaled air) by reacting it with lithium hydroxide, LiOH, pellets to form lithium carbonate, Li2C03, and water. If there are 7 astronauts on board the shuttle, and each exhales 20. L of air per minute, how long could clean air be generated if there were 25,000 g of LiOH pellets available for each shuttle mission? Assume the density of air is 0.0010 g1mL. Limiting Reactants and Percent Yield 107. Consider the reaction between below. O(g) and 02(g) represented 101. The reusable booster rockets of the U.S. space shuttle employ a mixture of aluminum and ammonium perchlorate for fuel. A possible equation for this reaction is 3AI(s) + 3NH4CI04(s) ~ A120ls) What mass of NH4Cl04 every kilogram of AI? + AICI3(s) + 3NO(g) + 6H20(g) should be used in the fuel mixture for What is the balanced equation for this reaction and what is the limiting reactant? 108. Consider the following reaction: 102. One of relatively few reactions that takes place directly between two solids at room temperature is Ba(OH)2 . 8H20(s) + NH4SCN(s) ~ Ba(SCNMs) + H20(l) + NH3(g) ... View Full Document

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