Constants I Periodic Table Part A Calculate the enthalpy change, AH, for the process in which 41.2 g of water is converted from liquid at 17.5 °C to vapor at 25.0 °C. For water, AHvap = 44.0 kJ/mol at 25.0 °C and C, = 4.18 J/(g C) for H20(1). Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) HA ? AH = Value kJ
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.
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<CH 07 HW
* Enthalpy of a Phase Change
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Constants I Periodic Table
Heat, q, is energy transferred between a system
and its surroundings. For a process that involves a
temperature change
Part A
q= m· C,· AT
where C, is specific heat and m is mass.
Calculate the enthalpy change, AH, for the process in which 41.2 g of water is converted from liquid
at 17.5 °C to vapor at 25.0 °C. For water, AHvap = 44.0 kJ/mol at 25.0 °C and C, = 4.18
J/(g. °C) for H2 0(1).
Heat can also be transferred at a constant
Express your answer to three significant figures and include the appropriate units.
temperature when there is a change in state. For a
process that involves a phase change
> View Available Hint(s)
q =n. AH
where, n is the number of moles and AH is the
enthalpy of fusion, vaporization, or sublimation.
HA
?
The following table provides the specific heat and
enthalpy changes for water and ice.
Value
kJ
ΔΗ-
Specific heat
ΔΗ
Substance
[J/(g-°C)]
(kJ/mol)
water
4.18
44.0
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Previous Answers
ice
2.01
6.01
X Incorrect; Try Again; 3 attempts remaining
Part B
How many grams of ice at -9.1 °C can be completely converted to liquid at 5.7 °C if the available
How many joules are th
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How do you convert 338
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