Sustainable Energy
1st Edition
ISBN: 9781133108689
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Chapter 4, Problem 7P
To determine
Find the gasoline required to burn to reach a lethal level of carbon monoxide.
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The Bunsen burner in your labs are fueled by natural gas, which is mostly methane, CH4. The
thermochemical equations for the combustion of methane (burning in oxygen) is:
CH4(g) + 2 O2(g) ➔ CO2(g) + 2 H2O (g) ΔH = – 890.3 kJ/mole
Calculate ΔH in kJ when 5.00 g CH4 react with an excess oxygen.
Q3: B:
A 208 g of C6H6 (78 g/mol.) burns in air according to the equation:
CHs + O2 - CO2 +H2O
What mass of CO2 (44 g/mol.) is produced?
The enthalpy of combustion of benzoic acid (C6 H5 COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be −3226.7 kJ/mol. When 1.9862 g of benzoic acid are burned in a calorimeter, the temperature rises from 21.84°C to 25.67°C. What is the heat capacity of the bomb? (Assume that the quantity of water surrounding the bomb is exactly 2000 g.)
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- If hydrogen followed an ideal gas law at all pressures, calculate the pressure at which the density of CHG would exceed that of LH2 (71 kg/m3).arrow_forwardQuestion 4 2.5 pts Nitrogen gas can be combined with oxygen to form nitric oxide (NO) as shown in the following chemical reaction: N2 (g) + O2 (g) 2 NO (g) When the reaction is in equilibrium, the concentration of N2, O2 and NO are 280 g/L, 640 g/L, and 750 g/L, respectively. If the concentration of oxygen gas dropped to half, calculate the concentration of nitric oxide (NO) in g/L when the system returns to equilibrium. (N=14, O=16 g/mol) Enter your final answer with 2 decimal places.arrow_forwardThe concentration of chlorine in a water tower tank was 2 mg/L when the tower was taken out of service. If the chlorine decays by first-order kinetics with a rate constant of 1.0 1/d, what is the chlorine concentration when the tank is put back in service 8 hours later? What mass of chlorine in kg must be added to the tank to raise the chlorine level back to 2 mg/L. (Assume completely-mixed tank).arrow_forward
- Determine the mass of carbon tetrachloride that should be mixed with 80 kg of glycerin so that the combined mixture has a density of 1450 kg/m3.arrow_forwardCellulose is to be burned in a waste to energy facility. The chemical equation for cellulose is C6H10O5. The atomic weights of C, H, and O are 12, 1, and 16, respectively. The ideal equation for the combustion of cellulose is C6H10O5 +6O2à6CO2 + 5H2O. Calculate the stoichiometric oxygen necessary for the combustion of cellulose. Calculate the stoichiometric air supply. The air is 23.15% oxygen by weight. If the facility operates at 1.5 tons/hour at 100% excess air. How much air is required?arrow_forwardThe change in internal energy for the combustion of 1.0 mol of octane at a pressure of 1.0 atm is -5084.3 kJ . If the change in enthalpy is -5074.0 kJ , how much work is done during the combustion? Express the work in kilojoules to three significant figures.arrow_forward
- It has been suggested that carbon dioxide emissions should be taxed at $30 per metric ton (106 g C). Removal of CO2 from the atmosphere would be worth the same amount. Assume that the atmospheric mixing ratio of CO2 is 400 ppm. What is the value of the carbon in 1 cubic kilometer (km3) of air at Earth’s surface? Calculate the value of all the CO2 in Earth’s atmosphere? [Hints: The total atmospheric mass is 5.1480×1018 kg and it is composed of 80% N2 and 20% O2.arrow_forwardMethanol (CH3OH) can be degraded as shown in the reaction below. Answer the following questions if methanol is present in a water at a concentration of 260 mg/L and the water flowrate is 1.7 million gallons per day (mgd). 2. CH3OH + 1.5 O2 → CO2 + 2 HLO What amount of carbon dioxide (CO2) will be produced each day (in lbs and kg)? How much oxygen (O2) will need to be supplied to degrade the methanol (in mg/L and lbs/day) if the oxygen transfer process is 48% efficient? а. b.arrow_forwardGiven the balanced chemical equation below, what volume of O2 is formed from the decomposition of 13.5 g of HgO if the gas has a pressure of 99 kPa and a temperature of 122°C?arrow_forward
- An average American consumes approximately 105 kJ of energy per day. The average life expectancy of an American is 77.9 years. How much coal would need to be burned to provide enough energy to meet a person's energy demands if the efficiency of energy production from coal is 38%? ☐g coalarrow_forwardCalculate the total mass of CO2 in the atmosphere. State all assumptions. Compare this to the actual of ~3.6 ×1012 tonnes. At our current rate of emissions, how long would it take to emit a quantity equal to the present mass of CO2 in the atmospherearrow_forwardIn the graph below, each unit on the horizontal axis is 1.90 103 m³ and each unit on the vertical axis is 0.200 atm. (a) Determine the change in internal energy of the gas if 2042 J of heat is added as it expands in volume along the direct path CA. 1306 J (b) To get the same change in internal energy, how much heat must be added to the gas as it goes along the path CBA? J just need help for part b B Aarrow_forward
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