Please answer question 12 part A and B Part AHow much heat energy, in kilojoules, is required to convert 51.0 g of ice at –18.0 °C to water at 25.0 °C ?Express your answer to three significant figures and include the appropriate units.• View Available Hint(s)HẢ?ValueUnitsPart BHow long would it take for 1.50 mol of water at 100.0 ° C to be converted completely into steam if heat were added ata constant rate of 21.0 J/s ?Express your answer to three significant figures and include the appropriate units.• View Available Hint(s)HẢ?ValueUnits EquationsThe heat energy associated with a change in temperature that does not involve a change in phase is given byq = MSATwhere q is heat in joules, m is mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g. °C), and ATis the temperature change in degrees Celsius. The heat energy associated with a change in phase at constanttemperature is given byq-mΔΗwhere q is heat in joules, m is mass in grams, and AH is the enthalpy in joules per gram.Physical constantsThe constants for H2O are shown here:2.09 J/(g·°C)Specific heat of ice: SiceSpecific heat of liquid water: Swater = 4.18 J/(g ·°C)Enthalpy of fusion (H2O(s)→H2O(1): AHfusEnthalpy of vaporization (H2O(1)→H2O(g)): AHvap334 J/g2250 J/g

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How much heat energy, in kilojoules, is required to convert 51.0 g of ice at – 18.0 °C to water at 25.0 °C ? Express your answer to three significant figures and include the appropriate units.

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter8: Thermochemistry

Section: Chapter Questions

Problem 31QAP: A student is asked to calculate the amount of heat involved in changing 10.0 g of liquid bromine at...

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Concept explainers

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.

Question

Please answer question 12 part A and B

Part A
How much heat energy, in kilojoules, is required to convert 51.0 g of ice at –18.0 °C to water at 25.0 °C ?
Express your answer to three significant figures and include the appropriate units.
• View Available Hint(s)
HẢ
?
Value
Units
Part B
How long would it take for 1.50 mol of water at 100.0 ° C to be converted completely into steam if heat were added at
a constant rate of 21.0 J/s ?
Express your answer to three significant figures and include the appropriate units.
• View Available Hint(s)
HẢ
?
Value
Units

Equations
The heat energy associated with a change in temperature that does not involve a change in phase is given by
q = MSAT
where q is heat in joules, m is mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g. °C), and AT
is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant
temperature is given by
q-mΔΗ
where q is heat in joules, m is mass in grams, and AH is the enthalpy in joules per gram.
Physical constants
The constants for H2O are shown here:
2.09 J/(g·°C)
Specific heat of ice: Sice
Specific heat of liquid water: Swater = 4.18 J/(g ·°C)
Enthalpy of fusion (H2O(s)→H2O(1): AHfus
Enthalpy of vaporization (H2O(1)→H2O(g)): AHvap
334 J/g
2250 J/g

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