Bundle: Sustainable Energy, 2nd + Mindtap Engineering, 1 Term (6 Months) Printed Access Card
2nd Edition
ISBN: 9781337896535
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Chapter 4, Problem 8P
To determine
Determine the required volume of calcium oxide.
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Methanol (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.
A gas undergoes a cycle in a piston-cylinder assembly consisting of the following three processes:
Process 1-2: Constant pressure, p = 1.4 bar, V₁ = 0.028 m³, W12 = 10 kJ
Process 2-3: Compression with pV = constant, U3 = U₂
Process 3-1: Constant volume, U₁ - U3 = -25 kJ
There are no significant changes in kinetic or potential energy.
(a) Calculate the net work for the cycle, in kJ.
(b) Calculate the heat transfer for process 1-2, in kJ.
Part A
Your answer is correct.
Calculate the net work for the cycle, in kJ.
Wcycle = -7.63
kJ
The principal component of LPG is butane, C4H10 (g). If combustion of 1 mole ofbutane produces 126 kJ of heat, how much heat can be generated by completecombustion of one 11.0 kg gas tank?
Chapter 4 Solutions
Bundle: Sustainable Energy, 2nd + Mindtap Engineering, 1 Term (6 Months) Printed Access Card
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- The ideal equation for the combustion of cellulose is C6H10O5 + 6O26O2 + 5H2O. What is a similar idealized equation for pyrolysis? What end products might you expect?arrow_forwardWrite down the chemical formulae for the combustion of the alkanes in Table 3.2 with n = 2 to n = 8. Determine the mass of CO2 produced per megajoule of energy.arrow_forwardOne gram of methane is burned, and the heat is used to raise the temperature of 1 kg of water. If the initial temperature of the water is 25C, what is the final temperature?arrow_forward
- Consider a 400-MW, 32 percent efficient coal-fired power plant that uses cooling water withdrawn from a nearby river (with an upstream flow of 10-m3/s and temperature 20 °C) to take care of waste heat. The heat content of the coal is 8,000 Btu/lb, the carbon content is 60% by mass, and the sulfur content is 2% by mass. How much electricity (in kWh/yr) would the plant produce each year? How many pounds per hour of coal would need to be burned at the plant? Estimate the annual carbon emissions from the plant (in metric tons C/year). If the cooling water is only allowed to rise in temperature by 10 °C, what flow rate (in m3/s) from the stream would be required? What would be the river temperature if all the waste heat was transferred to the river water assuming no heat losses during transfer? Estimate the hourly SO2 emissions (in kg/h) from the plant assuming that all the sulfur is oxidized to SO2 during combustion.arrow_forwardAn anaerobic digestion system generates 10,000 m3 (353,150 standard ft3) of biogas per day. The produced biogas is to be used in an engine generator for generating electricity for wastewater treatment plant operations. How much electricity can be generated from the biogas? Answer: 21,795 kWh/day.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
- Cellulose 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_forwardA new coal-fired power plant has been built using a sulfur emission control system that is 70 percent efficient. If all of the sulfur oxidizes to SO2 and if the emission of SO2 are lmited to 0.6 lb SO2 per million Btu of heat into the power plant, what maximum percent sulfur content can the fuel have if 15,000 Btu/lb coal is burned?arrow_forwardAnswers are given! please explain the steps of the full solution! ASAP Energy density of hydrogen in a 700bar tank is 5MJ/KG.arrow_forward
- choose the correct answerarrow_forwardThe 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.arrow_forwardProblem A reservoir of carbon tetrachloride (CCL) has a mass of 475kg and a volume of 0.285 m². Find the carbon tetrachloride's weight, mass density, specific weight, specific gravity and specific volume. ICarrow_forward
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