17. Under certain circumstances, carbon dioxide, CO2(g)CO2(g), can be made to react with hydrogen gas, H2(g)H2(g), to produce methane, CH4(g)CH4(g), and water vapor, H2O(g)H2O(g): CO2(g)+4H2(g)→CH4(g)+2H2O(g) A. How many moles of methane are produced when 85.1 molesmoles of carbon dioxide gas react with excess hydrogen gas? Express your answer with the appropriate units. B. How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 76.6 molesmoles of water vapor? Express your answer with the appropriate units.
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.
17. Under certain circumstances, carbon dioxide, CO2(g)CO2(g), can be made to react with hydrogen gas, H2(g)H2(g), to produce methane, CH4(g)CH4(g), and water vapor, H2O(g)H2O(g):
CO2(g)+4H2(g)→CH4(g)+2H2O(g)
A. How many moles of methane are produced when 85.1 molesmoles of carbon dioxide gas react with excess hydrogen gas?
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