What mass in grams of solute is needed to prepare 900mL of 6.10×10−2M KMnO4
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What mass in grams of solute is needed to prepare 900
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general chemistry problem set - Energy Relationships in Chemical Reactions
1. Consider the dissolving of ammonium nitrate, NH4NO3 (s), for which ∆H° = +25.3 kJ/mol. If 133 grams of
ammonium nit ...
general chemistry problem set - Energy Relationships in Chemical Reactions
1. Consider the dissolving of ammonium nitrate, NH4NO3 (s), for which ∆H° = +25.3 kJ/mol. If 133 grams of
ammonium nitrate are dissolved in 367 grams of water, and the initial temperature is 25.0°C, what will be
the final temperature of the system? You should assume that the specific heat of the entire system (the
ammonium nitrate and water combined) is 4.18 J/g°C. 2. Citric acid, represented by H3Cit, is a triprotic acid. A student mixes together the following solutions in a
styrofoam coffee cup: • 5.00 mL of 0.64 M citric acid
• 45.00 mL of 0.77 M NaOH
The two solutions start at a temperature of 25.5°C, and reach a final temperature of 27.8°C. The final,
combined mixture has a mass of 51.6 grams and a specific heat of 4.0 J/g°C. Assume that no heat is
transferred to the cup or surroundings.
a) Write a complete, balanced equation for the neutralization of citric acid (H3Cit) and NaOH.
b) Determine the total heat absorbed by the solution during this reaction.
c) Calculate the number of moles of citric acid that reacted.
d) Calculate the enthalpy of reaction, ∆H, for this reaction in kJ/mol. Is the reaction exothermic or
endothermic? 3. a) Using only the following information:
• ∆H°f for NO (g) is +90.4 kJ/mol
• ∆H° = –56.6 kJ/mol for the reaction: NO (g) + 1/2 O2 (g) à NO2 (g)
Determine ∆H°f for NO2 (g).
b) Using only your answer to (a) and the following information:
•∆H° = –283.0 kJ/mol for the reaction: CO (g) + 1/2 O2 (g) à CO2 (g)
Determine ∆H° for the reaction: 4 CO (g) + 2 NO2 (g) à 4 CO2 (g) + N2 (g)
c) A 10.0-L vessel contains 5.0 atm of CO and 3.0 atm of NO2 at 25°C. How much heat (in Joules) will
be liberated if this is allowed to react to completion according to the reaction in part (b)?
d) In a separate experiment using a very large reaction vessel with a movable piston, 6.00 moles of CO2 (g)
reacts completely with 3.00 moles of nitrogen gas according to the following equation at 25°C and with
a constant external pressure of 2.00 atm:
4 CO2 (g) + N2 (g) à 4 CO (g) + 2 NO2 (g)
This reaction proceeds to completion. Calculate ∆U, q, and w for this reaction under these conditions. 4. Given 100 g of hot tea at 90°C, what mass of ice at –10°C must be added in order to obtain a final
temperature of 10°C?
Useful Info: specific heat of ice = 2.09 J/g°C
specific heat of tea = specific heat of liquid water = 4.18 J/g°C
normal freezing point of water = 0°C normal boiling point of water = 100°C
∆H° = +6.01 kJ/mol for the melting of ice: H2O (s) → H2O (l)
Note: This problem is very similar to a problem in the Practice Problems. But watch out—it is not
identical!
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Competency
Implement critical thinking and research strategies for clear communication of written ideas.
Instructions
Produce a complete 2-4 page paper in which you do a comparison and contrast between driverless cars and/or traditionally driven cars. Be sure to define your reason for writing (thesis), and treat both ideas equally as to pros and cons, costs to promote, validity, efficiency to use, probability of success, and manpower requirements, etc. Your paper should contain an introductory paragraph, thesis statement, body paragraphs each supporting a major idea regarding your point for writing, and a concluding paragraph to wrap-up the paper and signal the completion of your support for your reason for writing.
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Most Popular Content
general chemistry problem set - Energy Relationships in Chemical Reactions
1. Consider the dissolving of ammonium nitrate, NH4NO3 (s), for which ∆H° = +25.3 kJ/mol. If 133 grams of
ammonium nit ...
general chemistry problem set - Energy Relationships in Chemical Reactions
1. Consider the dissolving of ammonium nitrate, NH4NO3 (s), for which ∆H° = +25.3 kJ/mol. If 133 grams of
ammonium nitrate are dissolved in 367 grams of water, and the initial temperature is 25.0°C, what will be
the final temperature of the system? You should assume that the specific heat of the entire system (the
ammonium nitrate and water combined) is 4.18 J/g°C. 2. Citric acid, represented by H3Cit, is a triprotic acid. A student mixes together the following solutions in a
styrofoam coffee cup: • 5.00 mL of 0.64 M citric acid
• 45.00 mL of 0.77 M NaOH
The two solutions start at a temperature of 25.5°C, and reach a final temperature of 27.8°C. The final,
combined mixture has a mass of 51.6 grams and a specific heat of 4.0 J/g°C. Assume that no heat is
transferred to the cup or surroundings.
a) Write a complete, balanced equation for the neutralization of citric acid (H3Cit) and NaOH.
b) Determine the total heat absorbed by the solution during this reaction.
c) Calculate the number of moles of citric acid that reacted.
d) Calculate the enthalpy of reaction, ∆H, for this reaction in kJ/mol. Is the reaction exothermic or
endothermic? 3. a) Using only the following information:
• ∆H°f for NO (g) is +90.4 kJ/mol
• ∆H° = –56.6 kJ/mol for the reaction: NO (g) + 1/2 O2 (g) à NO2 (g)
Determine ∆H°f for NO2 (g).
b) Using only your answer to (a) and the following information:
•∆H° = –283.0 kJ/mol for the reaction: CO (g) + 1/2 O2 (g) à CO2 (g)
Determine ∆H° for the reaction: 4 CO (g) + 2 NO2 (g) à 4 CO2 (g) + N2 (g)
c) A 10.0-L vessel contains 5.0 atm of CO and 3.0 atm of NO2 at 25°C. How much heat (in Joules) will
be liberated if this is allowed to react to completion according to the reaction in part (b)?
d) In a separate experiment using a very large reaction vessel with a movable piston, 6.00 moles of CO2 (g)
reacts completely with 3.00 moles of nitrogen gas according to the following equation at 25°C and with
a constant external pressure of 2.00 atm:
4 CO2 (g) + N2 (g) à 4 CO (g) + 2 NO2 (g)
This reaction proceeds to completion. Calculate ∆U, q, and w for this reaction under these conditions. 4. Given 100 g of hot tea at 90°C, what mass of ice at –10°C must be added in order to obtain a final
temperature of 10°C?
Useful Info: specific heat of ice = 2.09 J/g°C
specific heat of tea = specific heat of liquid water = 4.18 J/g°C
normal freezing point of water = 0°C normal boiling point of water = 100°C
∆H° = +6.01 kJ/mol for the melting of ice: H2O (s) → H2O (l)
Note: This problem is very similar to a problem in the Practice Problems. But watch out—it is not
identical!
Biology of the brain, assignment help
a)What research evidence supports the "lock and key" model for the mode of action of neurotransmitters?b) What can you ded ...
Biology of the brain, assignment help
a)What research evidence supports the "lock and key" model for the mode of action of neurotransmitters?b) What can you deduce about the biology of schizophrenia from the fact that haldoperidol, a dopamine-receptor antagonist, is successfully used to treat schizophrenia?
4 pages
Distance Learning
Distance education enables students to globally access education at a college or university level without attending a clas ...
Distance Learning
Distance education enables students to globally access education at a college or university level without attending a class physically. It therefore ...
4 pages
Ecological Footprint
How many planets (Earth) does it take to support your lifestyle? 1. How many planets (Earth) are needed to provide enough ...
Ecological Footprint
How many planets (Earth) does it take to support your lifestyle? 1. How many planets (Earth) are needed to provide enough resources to support people ...
Module 3 Driverless Cars vs Traditionally Driven Cars English Composition Deliverable Paper
Deliverable 03 - English Composition
Competency
Implement critical thinking and research strategies for clear communicatio ...
Module 3 Driverless Cars vs Traditionally Driven Cars English Composition Deliverable Paper
Deliverable 03 - English Composition
Competency
Implement critical thinking and research strategies for clear communication of written ideas.
Instructions
Produce a complete 2-4 page paper in which you do a comparison and contrast between driverless cars and/or traditionally driven cars. Be sure to define your reason for writing (thesis), and treat both ideas equally as to pros and cons, costs to promote, validity, efficiency to use, probability of success, and manpower requirements, etc. Your paper should contain an introductory paragraph, thesis statement, body paragraphs each supporting a major idea regarding your point for writing, and a concluding paragraph to wrap-up the paper and signal the completion of your support for your reason for writing.
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