Calculate the amount of energy in kilojoules needed to change 243 g of water ice at –10 °C to steam at 125 °C. The following constants may be useful: • Cm (ice) = 36.57 J mol¬1 °C-1 Cm (water) = 75.40 J mol¬1 °C-1 • Cm (steam) = 36.04 J mol-1 °C-1 Afus H = +6.01 kJ mol¬! Avap H = +40.67 kJ mol¬1 Express your answer with the appropriate units. HA ? Value Units Submit Request Answer
Calculate the amount of energy in kilojoules needed to change 243 g of water ice at –10 °C to steam at 125 °C. The following constants may be useful: • Cm (ice) = 36.57 J mol¬1 °C-1 Cm (water) = 75.40 J mol¬1 °C-1 • Cm (steam) = 36.04 J mol-1 °C-1 Afus H = +6.01 kJ mol¬! Avap H = +40.67 kJ mol¬1 Express your answer with the appropriate units. HA ? Value Units Submit Request Answer
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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Transcribed Image Text:Part B
Calculate the amount of energy in kilojoules needed to change 243 g of water ice at –10 °C to steam at 125 °C. The following constants may be useful:
Cm (ice) = 36.57 J mol-1 °C-1
Cm (water) = 75.40 J mol-1 °C-1
Cm (steam) = 36.04 J mol-1 °C-1
Afus H = +6.01 kJ mol¬1
Avap H = +40.67 kJ mol¬1
Express your answer with the appropriate units.
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Transcribed Image Text:Matter can change from one physical state (phase) to another without any change in chemical identity. Each
change is characterized by a specific name, a APCH (enthalpy) value, and a ApcS (entropy) value. The
energy involved in phase changes and temperature changes can be calculated by using the following equations.
For a phase change (with no change in temperature)
energy
ApcH × n
where ApcH is the enthalpy change for that transition and n is the number of moles of the substance.
For a temperature change (with no change in phase)
energy
Cη x ΔTx n
where Cm is the molar heat capacity, n is the number of moles, and AT is the temperature change in degrees
Celsius.
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