quid mercury solidifies at –38.83 °C and boils at 356.73 °C. Identify the type(s) of phase(s) present when 3.57 kJ of heat energy is removed from 10.0 g of gaseous mercury initially at 425 °C. Consider that all processes occur at 1 atm (760 torr). For mercury: Heat of fusion = 11.6 J/g Heat of vaporization = 292 J/g Specific heat capacity (solid) = 0.141 J/g·K Specific heat capacity (liquid) = 0.138 J/g·K Specific heat capacity (gas) = 0.104 J/g·K a. liquid and gaseous mercury b. solid and liquid mercury c. mainly solid mercury d. mainly liquid mercury Using the information given for mercury above, what would be the vapor pressure of mercury (in torr) at 250.00 °C? Molar mass of mercury = 200.59 g/mol a. 78 torr b. 95 torr c. 120 torr d. 86 torr Explain why.
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.
Liquid mercury solidifies at –38.83 °C and boils at 356.73 °C. Identify the type(s) of phase(s) present when 3.57 kJ of heat energy is removed from 10.0 g of gaseous mercury initially at 425 °C. Consider that all processes occur at 1 atm (760 torr).
For mercury:
Heat of fusion = 11.6 J/g
Heat of vaporization = 292 J/g
Specific heat capacity (solid) = 0.141 J/g·K
Specific heat capacity (liquid) = 0.138 J/g·K
Specific heat capacity (gas) = 0.104 J/g·K
Using the information given for mercury above, what would be the vapor pressure of mercury (in torr) at 250.00 °C?
Molar mass of mercury = 200.59 g/mol
Explain why.
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