A typical room in a house contains 5.10 x 104 L of air (density = 1.29 g/L). How many moles of propane, C3H8, are needed to heat this room from 17.0 °C to 23.0 °C given that the ∆H for the combustion of propane is -2200. kJ/mol and the specific heat of air is 1.012 J/g°C? You may assume that the room is sufficiently well insulated that the walls absorb no heat, and that the pressure is constant.
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.
A typical room in a house contains 5.10 x 104
L of air (density = 1.29 g/L). How many moles of
propane, C3H8, are needed to heat this room from 17.0 °C to 23.0 °C given that the ∆H for the
combustion of propane is -2200. kJ/mol and the specific heat of air is 1.012 J/g°C? You may
assume that the room is sufficiently well insulated that the walls absorb no heat, and that the
pressure is constant.
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