1. Calculate ΔH for the reaction: 2 C(s) + H2(g) → C2H2(g) given the following chemical equations and their respective enthalpy changes: C2H2(g) + 5252 O2(g) → 2 CO2(g) + H2O(l) ΔH = -1299.6 kJ C(s) + O2(g) → CO2(g) ΔH = -393.5 kJ H2(g) + ½ O2(g) → H2O(l) ΔH = -285.8 kJ Indicate the correct charge and unit of the final answer.
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.
1. Calculate ΔH for the reaction: 2 C(s) + H2(g) → C2H2(g) given the following chemical equations and their respective enthalpy changes:
C2H2(g) + 5252 O2(g) → 2 CO2(g) + H2O(l) ΔH = -1299.6 kJ
C(s) + O2(g) → CO2(g) ΔH = -393.5 kJ
H2(g) + ½ O2(g) → H2O(l) ΔH = -285.8 kJ
Indicate the correct charge and unit of the final answer.
2. The experimentally determined rate law for the reaction
2 NO(g) + 2 H2(g) → N2(g) + 2 H2O(g)
is rate = k[NO]2[H2].
The reaction is __________ order in NO and __________ order in H2. The overall order of reaction is __________ order. Assuming that the [NO] remains constant, tripling the concentration of H2 will ___________ the
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