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 Cs is specific heat and m is mass. Calculate the enthalpy change, AH, for the process in which 38.9 g of water is converted from liquid at 0.1 °C to vapor at 25.0 °C. For water, AH 44.0 kJ/mol at 25.0 °C and Cs = 4.18 J/(g . °C) for H20(1). vap Heat can also be transferred at a constant temperature when there is a change in state. For a process that involves a phase change Express your answer to three significant figures and include the appropriate units. q = n· AH • View Available Hint(s) where, n is the number of moles and AH is the enthalpy of fusion, vaporization, or sublimation. AH = 99.0 kJ %D The following table provides the specific heat and enthalpy changes for water and ice. Submit Previous Answers Specific heat ΔΗ Substance [J/(g. °C)] (kJ/mol) water 4.18 44.0 Correct ice 2.01 6.01 The enthalpy change is positive because heat is being transferred from the surroundings into the system. Part B How many grams of ice at -5.0 °C can be completely converted to liquid at 16.8 °C if the available heat for this process is 5.27x103 kJ ? For ice, use a specific heat of 2.01 J/(g · °C) and AHFUS 6.01kJ/mol . Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) НА Value Units Şubmit
Basics in Organic Reactions Mechanisms
In organic chemistry, the mechanism of an organic reaction is defined as a complete step-by-step explanation of how a reaction of organic compounds happens. A completely detailed mechanism would relate the first structure of the reactants with the last structure of the products and would represent changes in structure and energy all through the reaction step.
Heterolytic Bond Breaking
Heterolytic bond breaking is also known as heterolysis or heterolytic fission or ionic fission. It is defined as breaking of a covalent bond between two different atoms in which one atom gains both of the shared pair of electrons. The atom that gains both electrons is more electronegative than the other atom in covalent bond. The energy needed for heterolytic fission is called as heterolytic bond dissociation energy.
Polar Aprotic Solvent
Solvents that are chemically polar in nature and are not capable of hydrogen bonding (implying that a hydrogen atom directly linked with an electronegative atom is not found) are referred to as polar aprotic solvents. Some commonly used polar aprotic solvents are acetone, DMF, acetonitrile, DMSO, etc.
Oxygen Nucleophiles
Oxygen being an electron rich species with a lone pair electron, can act as a good nucleophile. Typically, oxygen nucleophiles can be found in these compounds- water, hydroxides and alcohols.
Carbon Nucleophiles
We are aware that carbon belongs to group IV and hence does not possess any lone pair of electrons. Implying that neutral carbon is not a nucleophile then how is carbon going to be nucleophilic? The answer to this is that when a carbon atom is attached to a metal (can be seen in the case of organometallic compounds), the metal atom develops a partial positive charge and carbon develops a partial negative charge, hence making carbon nucleophilic.
Please answer part B
![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 Cs is specific heat and m is mass.
Calculate the enthalpy change, AH, for the process in which 38.9 g of water is converted from liquid at 0.1 °C to vapor at 25.0 °C. For water, AH
44.0 kJ/mol at 25.0 °C and Cs = 4.18 J/(g . °C) for H20(1).
vap
Heat can also be transferred at a constant temperature when
there is a change in state. For a process that involves a phase
change
Express your answer to three significant figures and include the appropriate units.
q = n· AH
• View Available Hint(s)
where, n is the number of moles and AH is the enthalpy of
fusion, vaporization, or sublimation.
AH = 99.0 kJ
%D
The following table provides the specific heat and enthalpy
changes for water and ice.
Submit
Previous Answers
Specific heat
ΔΗ
Substance
[J/(g. °C)]
(kJ/mol)
water
4.18
44.0
Correct
ice
2.01
6.01
The enthalpy change is positive because heat is being transferred from the surroundings into the system.
Part B
How many grams of ice at -5.0 °C can be completely converted to liquid at 16.8 °C if the available heat for this process is 5.27x103 kJ ?
For ice, use a specific heat of 2.01 J/(g · °C) and AHFUS
6.01kJ/mol .
Express your answer to three significant figures and include the appropriate units.
• View Available Hint(s)
НА
Value
Units
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