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- 17. Under certain circumstances, carbon dioxide, CO2(g)CO2(g), can be made to react with hydrogen gas, H2(g)H2(g), to produce methane, CH4(g)CH4(g), and water vapor, H2O(g)H2O(g): CO2(g)+4H2(g)→CH4(g)+2H2O(g) A. How many moles of methane are produced when 85.1 molesmoles of carbon dioxide gas react with excess hydrogen gas? Express your answer with the appropriate units. B. How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 76.6 molesmoles of water vapor? Express your answer with the appropriate units.5 ✓7 D ✔B ✓9 ✓ 10 ✓11 12 The human body burns glucose (C,H,O,) for energy according to this chemical reaction: CH₁₂0+60-6CO₂ + 6H₂0 The products of the reaction are carbon dioxide (CO₂) and water (H₂O). Interestingly, all of the carbon dioxide and much of the water exits the body through the lungs: on every breath, the average person exhales 500 ml. of air, which is typically enriched to 4% CO, and 5% water vapor by volume. In short, when a person loses weight by dieting, the weight that is lost actually departs his body as a gas, every time he exhales. Each kilogram of body fat lost requires exhaling about 2.8 kg of carbon dioxide. Calculate how many breaths it takes an average person to "exhale" 3.00 kg of fat. Round your answer to the nearest thousand. You'll need to know that the density of CO₂ is 2.0 kg/m³. 10 13 ? DAnna was asked to identify and explain if the equation CO2 (g) → CO2 (I) was an endothermic or exothermic reaction. However she got it wrong. What is her error and what should the answer have been? Anna's statement: The equation is an endothermic reaction because the energy is released from gaseous CO2 to the surroundings to become liquidCO, causing the molecules to speed up.
- 10) Hydrocarbons are organic compounds consisting of hydrogen and carbon only. Burning hydrocarbons in the presence of oxygen, O2, produces carbon She oxide, CO₂, and water, H₂O. Methane, CH4, is a hydrocarbon used primarily as fuel to make heat and light. The overall reaction of a number of such steps of methane gas is: CH4(g) + O2(g) + NO(g) → CO2(g) + H2O(g) + NO2(g) + OH(g) Suppose that 3.92 L of methane at STP, 10.8 L of oxygen at STP, and 8.3 L of nitrogen monoxide at STP were combined in a 7.0 L flask. The reaction is allowed the stand for several weeks at 275 K. If the reaction reaches 79.5% of completion, what is the total pressure in the flask? What is the partial pressure of CH4(g) and H2O(g) in the flask?The sun supplies energy at a rate of about 1.0 kilowatt per square meter of surface area (1 watt = 1 J/s). The plants in an agricultural field produce the equivalent of 23 kg of sucrose (C12H22 O11) per hour per hectare (1 ha = 10,000 m²). Assuming that sucrose is produced by the reaction 12CO₂(g) + 11H₂O(l) → C12H22 O11 (8) + 1202 (9) AH = 5640 kJ calculate the percentage of sunlight used to produce the sucrose - that is, determine the efficiency of photosynthesis in this field. Percent efficiency = %Given that the reaction N2(g) + 2 O2(g) → 2 NO2(g) is endothermic, what is true of the reaction 2 NO2(g) → 2 N2(g) + 2 O2(g) ?
- ||| ANAN Microsoft O V The extraction of aluminum metal from the aluminum hydroxide found in bauxite by the Hall-Héroult process is one of the most remarkable success stories of 19th century chemistry, turning aluminum from a rare and precious metal into the cheap commodity it is today. In the first step, aluminum hydroxide reacts to form alumina (Al₂O3) and water: 2Al(OH)3(s) → Al₂O3(s) + 3H₂O(g) W Microsoft CHEMICAL REACTIONS Reaction sequence stoichiometry Microsoft 6.52.210... esc In the second step, alumina (Al2O3) and carbon react to form aluminum and carbon dioxide: 2Al₂O3(s) + 3C(s) → 4Al(s) + 3 CO₂ (8) Suppose the yield of the first step is 91.% and the yield of the second step is 85.%. Calculate the mass of aluminum hydroxide required to make 6.0 kg of aluminum. Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits. Explanation Check 9,269 Q x10 HH 103 X OCT 24 ロ・ロ S OOO tv NONZA © 2022 McGraw Hill LLC. All Rights…A chemist went on a trip to Zambales to obtain a sample of chalcocite (copper (I) sulfide), one of the most important ores of copper. He tried to extract copper from the ore by performing the following steps: Step 1: 2Cu2S(s) + 3O2(g) = 2Cu2O(s) + 2SO2(g) Step 2: Cu2O(s) + H2(g) = 2Cu(s) + H2O Question: If the chemist acquired 98.4 grams of chalcocite during his trip, calculate the theoretical yield of metallic copper in his experiment. Express your answer in 3 significant figures. (Please solve the question clearly and with explanation).Al llevar a cabo esta reacción, el (los) producto(s) mayoriatios(s) es(son): HO NaNH, NH3
- Anna was asked to identify and explain if the equation CO2 (l) → CO2 (g) was an endothermic or exothermic reaction. However she got it wrong. What is her error and what should the answer have been? Anna's statement: The equation is an exothermic reaction because the energy is released from liquid CO2 to the surroundings to become gaseous CO2 causing the molecules to slow down.3H2(9)さN2(g) >2NH3 Heat How is equilibnum affecte dby an increase inres い メ :A) cannot be determeneddups trol B)けsnif+S すthelefti o2 c)if shifts to the right D)it ha no effec 29Howis equilibrumaffected by a decrease in temperature ?o A)エ+ shこfts to the lef T B)It has no effect c)If shifts to the night )cannot be determined.74 CHu + 2 Oze) CO2ig) + 2 H2O1n COue) +2 H;0n CHe) + 2 Oze) 2 C,H180 + 25 Ozug) 16 CO) + 18 H;Og 2 CH,OH, + 3 0ze) → 2C0u9+4H;0µ Which of the following is an endothermic reaction? * 2 C3H18(1) + 25 O218) → 16 CO218) + 18 H2O(g) 2 CH3OH) + 3 O2«) - 2 CO2e) + 4 H,O CO2ne) + 2 H2O) CHẠE) + 2 O2ie) CH4(g) + 2 O28) CO26) + 2 H2O)
