Whenever organic matter is decomposed 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 sources of natural gas can produce 5600 EJ of energy(1 EJ 10^18J). Current total global energy usage is 4.0X10^2 EJper year. Find the mass (in kg) of known sources of natural gas(Hrxnfor the combustion of CH₄=802 kJ/mol).(b) For how many years could these sources supply the world’stotal energy needs?(c) What volume (in ft³) of natural gas, measured at STP, isrequired to heat 1.00 qt of water from 25.0C to 100.0C (d of H₂O= 1.00 g/mL; d of CH₄ at STP =0.72 g/L)?(d) The fission of 1 mol of uranium (about 4X10^4 ft³) in a nu-clear reactor produces 2X10^13 J. What volume (in ft3) of naturalgas would produce the same amount of energy?
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.
Whenever organic matter is decomposed 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 sources of natural gas can produce 5600 EJ of energy(1 EJ 10^18J). Current total global energy usage is 4.0X10^2 EJper year. Find the mass (in kg) of known sources of natural gas(Hrxnfor the combustion of CH₄=802 kJ/mol).(b) For how many years could these sources supply the world’stotal energy needs?(c) What volume (in ft³) of natural gas, measured at STP, isrequired to heat 1.00 qt of water from 25.0C to 100.0C (d of H₂O= 1.00 g/mL; d of CH₄ at STP =0.72 g/L)?(d) The fission of 1 mol of uranium (about 4X10^4 ft³) in a nu-clear reactor produces 2X10^13 J. What volume (in ft3) of naturalgas would produce the same amount of energy?
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