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- Determine rxnH 25 C for the following reaction: NO g O2 g NO2 g This reaction is a major participant in the formation of smog.Substances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?The label on a bottle of 3% (by volume) hydrogen peroxide, H2O2, purchased at a grocery store, states that the solution should be stored in a cool, dark place. H2O2decomposes slowly over time, and the rate of decomposition increases with an increase in temperature and in the presence of light. However, the rate of decomposition increases dramatically if a small amount of powdered MnO- is added to the solution. The decomposition products are H2O and O2. MnO2 is not consumed in the reaction. Write the equation for the decomposition of H2O2. What role does MnO2 play? In the chemistry lab, a student substituted a chunk of MnO2 for the powdered compound. The reaction rate was not appreciably increased. WTiat is one possible explanation for this observation? Is MnO2 part of the stoichiometry of the decomposition of H2O2?
- The following equation represents a reversible decomposition: CaCO3(s)CaO(s)+CO2(g) Under what conditions will decomposition in a closed container proceed to completion so that no CaCO3 remains?Amoxicillin is an antibiotic packaged as a powder. When it is used to treat babies and small animals, the pharmacist or veterinarian must suspend it in water, so that it can be administered orally with a medicine dropper. The label says to dispose of unused suspension after 14 days. It also points out that refrigeration is required. In the context of this chapter, what is implied in the latter two statements?6:00 pm Remaining Time: 01:15:20 Calcium chloride, CaCl2 and sodium phosphate, Na3PO4 react as follows. 3 CaCl2(aq) + 2 Na3PO4(aq) → Ca3(PO4)2(s) + 6 Nacl(aq) Molar Masses CaCl2 NazPO4 Ca3(PO4)2 NaCl (in g mol-1) 110.98 141.96 310.18 58.44 The reaction results in a 79.2% yield for the production of Ca3(PO4)2. If excess Na3PO4 is used, what mass of CaCl2 would be required to produce 14.1 g of Ca3(PO4)2? 12.0 g 2.12 g O 6.37 g 15.6 g 19.1 g Question Menu - Naxt Вack Quit & Save Submit Assignment MacBook Air F12 DD DII F11 F10 F9 F8 F7 F6 ( ) & 7
- Determine each type of reaction. NH,NO3 (s) → N,O (g) +2 H2O (1) Choose... CO (g) + 2 H2 (g) → CH3OH (1) Choose.. CaCl2 (aq) + Na,CO3 (aq) → 2 NaCl (aq) + CACO3 (s) Choose.. 2 C2H2 (g) + 5 02 (g) → 4 CO2 (g) + 2 H2O (1) Choose... | 2 Fe (s) + 6 HC1 (aq) → 2 FeCl3 (aq) + 3 H2 (g) Choose...In the laboratory, hydrogen gas of good purity can most easily be obtained by the reaction of a strong acid, like sulfuric acid, on a reactive metal, such as zinc: Zn(s)+H,SO,(uq) - ZnS0, (ag) +H,{g) Suppose an engineer decides to study the rate of this reaction. He prepares four reaction vessels by adding 131.1 g of solid zinc and 74. mL of 5.0 M sulfuric acid solution to each, and then filling the remainder of the vessel with distilled water. The volume and temperature of each vessel is shown in the table below. Arrange the reaction vessels in decreasing order of initial rate of reaction. In other words, select a "1" next to the vessel in which the engineer can reasonably expect the initial rate of reaction to be highest, a "2" next to the vessel in which the initial rate of reaction would be next highest, and so on. Initial rate of reaction vessel volume temperature S0L 20 °C 5.0L -2,0 °C 50L 0°C 50L -3.0°CRemaining Time: 01:18:00 Iron, Fe, will reduce arsenic acid, H3ASO4, to produce highly poisonous arsine gas, AsH3, according to the following equation. 8 Fe3*(aq) 3 H3ASO4(aq) + 8 Fe(s) + 24 H*(aq) → 3 ASH3(g) + 12 H20(I) + Molar masses: Fe = 55.85 g mol; H3ASO4 = 141.94 g mol-1 What mass of iron would be required to react with 290 mL of 0.650 mol L¯1 H3ASO4(aq)? Enter a mass accurate to 3 significant figures. Number Submit Assignment Quit & Save Вack Question Menu - Next MacBook Air DII DD F12 F11 F10 F8 F9 F6 F7 * 7 8 9. { P
- The reversible chemical process to form phosphorous pentachloride, PCI,(g), is carried out and the concentrations of the starting substances and products are carefully monitored. Which of the following is true at 200 seconds? Cl₂(g) + PCI3(g) → PC15(g) Time (s) [Cl₂] mol/L [PCI3] mol/L [PCI,] mol/L 0 2.00 2.00 0.00 40 1.80 1.80 0.20 80 1.60 1.60 0.40 120 1.50 1.50 0.50 160 1.42 1.42 0.58 200 1.42 1.42 0.58 240 1.42 1.42 0.58 The rate of the forward process is greater than the rate of the reverse process. The rate of the reverse process is zero. The rate of the forward process is equal to the rate of the reverse process. The rate of the forward process is less than the rate of the reverse process.(b) Quantities of chemicals, expressed in moles, can be used to find the formula of a compound, to establish an equation and to determine reacting masses. A compound contains 72% magnesium and 28% nitrogen. What is its empirical formula? ( 2) 2. A student investigates the rate of reaction between lumps of calcium carbonate and dilute hydrochloric acid using the apparatus shown. CaCo3(s) + 2HCI (aq) CaCI 2(aq) + CO2(g) + H2O(I) The calcium carbonate was in excess. gas syringe lumps of calcium carbonate dilute hydrochloric acidIn aqueous solution, chlorine dioxide oxidizes iodide ion to iodine and chlorine dioxide is reduced to chlorite ion. 2ClO2 (aq) + 2 I- (aq) ----> 2ClO2- (aq) + I2 (aq) The concentration in molarity, of ClO2 was measured at various time points. The data was plotted and the plot of [1/[ClO2] versus time in seconds was most linear. The linear regression equation for the plot is y= 7.60x10-2 (t) + 2.353. What is the concentration of ClO2 at 2.00 minutes if the initial concentration of ClO4 ia 0.425 M? a.) 0.0872 M b.) 2.50 M c.) 11.5 M d.) 0.399 M
