Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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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.
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.)
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?
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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_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_forward
- Cellulose 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_forwardIf 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_forwardAn insulated Thermos contains 110 cm3 of hot coffee at 83.0°C. You put in a 15.0 g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were pure water and neglect energy exchanges with the environment. The specific heat of water is 4186 J/kg-K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm³. Number i 52.42 Units C°arrow_forward
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