SUSTAINABLE ENERGY (LL)
2nd Edition
ISBN: 9780357667224
Author: DUNLAP
Publisher: CENGAGE L
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Textbook Question
Chapter 3, Problem 11P
The combustion of pure hydrogen by the reaction
produces 142 MJ per kg of hydrogen. Compare the energy per kg of octane and the total energy from the individual combustion of its carbon and hydrogen atoms.
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The 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.
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?
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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- 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.arrow_forwardThe 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?arrow_forwardWhen methanol is used to generate hydrogen, it reacts with the following reaction: CH3OH => CO + 2 H2 The reaction is second order with regards to methanol (CH3OH) and it is observed that 100 g/L of carbon monoxide (CO) can be produced in one day in a batch reactor, if you start with 200 g/L of methanol. What is the rate constant of this reaction (don’t forget to include units)?arrow_forward
- Environmental Engineering When methanol is used to generate hydrogen, it reacts with the following reaction: CH3OH>>>>CO+2H2 The reaction is second order in methanol, and it is observed that 100g of carbon monoxide can be produced in one day in a batch reactor, if you start with 200g of methanol. What is the rate constant for this reaction?arrow_forwardQ3: 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?arrow_forwardCellulose is to be burned in a waste-to- energy fadlity. The chemical equation for cellulose C6 H10O5is the atomic weights of C, H, and O are 12, 1, and 16. respectively. a. Calculate the stoichiometric oxygen necessary for the combustion of cellulose. b. Calculate stoichiometric air.arrow_forward
- 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_forwardWhen Ethanol is burn in the presence of Oxygen. Carbon Dioxide (CO2) and water (H2O) molecules are produced. The unbalance reaction of Ethanol and oxygen is given as C2 H5OH + O2→ CO2 +H2O How many grams of Oxygen is required to completely burn 920 grams of Ethanol? Atomic weight: C =12: H = 1: 0 = 16arrow_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_forward
- (a) Locate, from an appropriate source, the composition for methanol and ethanol. Write down the formulas for the combustion of these two hydrocarbons. (b) Calculate the mass of CO2 produced per kg of methanol and ethanol burned. (c) Locate values for the heat of combustion of methanol and ethanol and determine the mass of CO2 produced per MJ 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_forwardAn 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_forward
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