When organic matter decomposes under oxygen-free (anaerobic) conditions, methane is one of the products. Thus, enormous deposits of natural gas, which is almost entirely methane, serve as a major source of fuel for home and industry. (a) Known deposits of natural gas can produce 5,400 EJ of energy (1 EJ = 10¹8 J). Current total global energy usage is 3.9 x 102 EJ per year. Find the mass (in kg) of known deposits of natural gas (A H for the combustion of CH4-802 kJ/mol). rxn x 10 kg CH4 (b) At current rates of usage, for how many years could these deposits supply the world's total energy needs? yr (c) What volume (in ft³) of natural gas, measured at STP, is required to heat 1.00 qt of water from 25.0°C to 59.1°C (d of H₂O-1.00 g/mL; d of CH4 at STP=0.72 g/L)? ft³ (d) The fission of 1 mol of uranium (about 4 x 10-4 ft) in a nuclear reaftor produces 2 x 10¹3 J. What volume (in ft) of natural gas would produce the same amount of energy? x 10
When organic matter decomposes under oxygen-free (anaerobic) conditions, methane is one of the products. Thus, enormous deposits of natural gas, which is almost entirely methane, serve as a major source of fuel for home and industry. (a) Known deposits of natural gas can produce 5,400 EJ of energy (1 EJ = 10¹8 J). Current total global energy usage is 3.9 x 102 EJ per year. Find the mass (in kg) of known deposits of natural gas (A H for the combustion of CH4-802 kJ/mol). rxn x 10 kg CH4 (b) At current rates of usage, for how many years could these deposits supply the world's total energy needs? yr (c) What volume (in ft³) of natural gas, measured at STP, is required to heat 1.00 qt of water from 25.0°C to 59.1°C (d of H₂O-1.00 g/mL; d of CH4 at STP=0.72 g/L)? ft³ (d) The fission of 1 mol of uranium (about 4 x 10-4 ft) in a nuclear reaftor produces 2 x 10¹3 J. What volume (in ft) of natural gas would produce the same amount of energy? x 10
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter12: Thermodynamic Processes And Thermochemistry
Section: Chapter Questions
Problem 71AP
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
Transcribed Image Text:Be sure to answer all parts.
When organic matter decomposes under oxygen-free (anaerobic) conditions, methane is one of the
products. Thus, enormous deposits of natural gas, which is almost entirely methane, serve as a major
source of fuel for home and industry.
(a) Known deposits of natural gas can produce 5,400 EJ of energy (1 EJ = 10¹8 J). Current total
global energy usage is 3.9 × 102 EJ per year. Find the mass (in kg) of known deposits of natural gas (A
0
H for the combustion of CH4 = -802 kJ/mol).
rxn
x 10
kg CH4
(b) At current rates of usage, for how many years could these deposits supply the world's total energy
needs?
yr
(c) What volume (in ft³) of natural gas, measured at STP, is required to heat 1.00 qt of water from
25.0°C to 59.1°C (d of H₂O = 1.00 g/mL; d of CH4 at STP = 0.72 g/L)?
ft³
(d) The fission of 1 mol of uranium (about 4 x 10-4 ft³) in a nuclear reactor produces 2 × 10¹3 J.
What volume (in ft) of natural gas would produce the same amount of energy?
x 10
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