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Thermodynamics: Work Done During Acid Digestion of Magnesium

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Wize University Physics Textbook (Master) > Thermodynamics

Ideal Gases and First Law of Thermodynamics

4 Activities

Wize University Chemistry Textbook > Electrochemistry

Balancing Redox Reactions

2 Activities

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A 10.0 g piece of Mg(s) is deposited in a container with a vast excess of HCl(aq). A reaction takes place forming hydrogen gas and Magnesium Chloride.
a) Write a balanced chemical reaction for the transformation

b) Calculate the work done by the system as a consequence of the reaction, if Pex = 1.1 atm and T = 298.15 K. You may assume ideal behaviour.
More Ideal Gases and First Law of Thermodynamics Questions:
Thermodynamics
2.3 moles of an ideal gas initially at -12oC and 16 atm underwent a complete expansion against a constant external pressure of 1atm and did 1.1kJ of work. Calculate ΔE, Δ𝐻, 𝑎𝑛𝑑 𝑞 for this process.
A 2.00 mole sample of a monoatomic ideal gas is initially at 1.00 L and 1.00 atm. Calculate the total q, w, ΔE{\small \Delta\text{E}}and ΔH{\small \Delta \text{H}}when the final conditions are 0.500 L and 5.00 atm along the pathway where the volume is compressed first.
[Do NOT include units in your answers]
Thermodynamics: Reaction of Mg with HCl
A 10.0 g piece of Mg(s) is deposited in a container with a vast excess of HCl(aq). A reaction takes place forming hydrogen gas and Magnesium Chloride. Write a balanced chemical reaction for the transformation and calculate the work done by the system as a consequence of the reaction, if Pex = 1.1 atm and T = 298.15 K. You may assume ideal behaviour.
How much work is performed in Joules when 3.00 mols of N2(g) expands against 1 atm of external pressure via heating from 298 K to 498 K at constant pressure of 1 atm?
Thermodynamics and Ideal Gases
An ideal gas at 30.0 C and pressure of 2 × 105 Pa is in a container having a volume of 1.40 L.
Determine the number of moles of gas in the container.
The gas pushes against a piston, expanding to twice its original volume, while the pressure falls to atmospheric pressure. Find the final temperature.
Heat is an
extensive
property while temperature is
intensive
property
Heat is related to
total thermal
energy while temperature is related to
average thermal
energy
The internal energy of n moles of an ideal gas depends on
A gas in a cylinder with a moveable piston is heated with 50 J of energy, causing the piston to move rise. If the thermal energy of the system increases by 30 J, how much work is done by the gas?
More Balancing Redox Reactions Questions:
Electrochemistry: Redox
Balance the following redox reaction in basic solution:
Cr(OH)3 + Br2 → CrO42- + Br- in basic solution
Electrochemistry: Redox
Balance the following redox reaction in an acidic solution.
HCOOH + MnO4- --> CO2 + Mn2+
Aqua regia is a mixture of concentrated HNO3 and HCl developed to dissolve gold. The process is a redox reaction as follows:
Au(s)+NO3(aq)−+Cl(aq)−→AuCl4(aq)−+NO2(g)Au_{(s)}+NO^-_{3(aq)}+Cl^-_{(aq)} \to AuCl^-_{4(aq)}+NO_{2(g)}
Balance this reaction under acidic conditions and identifying the oxidized and reduced species.
Balance the following redox reaction in basic solution:
Cr(OH)3 + Br2 --> CrO42- + Br- in basic solution
Balance the following redox reaction in an acidic solution.
HCOOH + MnO4- --> CO2 + Mn2+
Electrochemistry: Balancing Redox Reactions (Basic)
Balance the following redox reaction under basic condition:
Sn(OH)3− (aq) + Bi(OH)3 (s) → Sn(OH)62− (aq) + Bi (s)
Balance the following redox reaction:
HBrO (aq) → Br− (aq) + O2 (g) under acidic condition
Balancing Redox Reactions (Basic)
Balance the following redox reactions under basic condition:
Cl2 (aq) → ClO3− (aq) + Cl− (aq)
Sn(OH)3− (aq) + Bi(OH)3 (s) → Sn(OH)62− (aq) + Bi (s)
Balancing Redox Reactions (Acidic)
Balance the following redox reactions under acidic condition:
H2S (aq) + H2O2 (aq) → S (s) (acidic solution)
P4 (s) + NO3− (aq) → H3PO4 (aq) + NO (g) (acidic solution)
Balance the following redox reaction in acidic conditions. What is the coefficient on H+?
Cr2O9 2−(aq)+HNO2(aq)→Cr3+(aq)+NO3 −(aq){\small \text{Cr}_2\text{O}_9\ ^{2-}\text{(aq)} + \text{HNO}_2\text{(aq)} \rightarrow \text{Cr}^{3+}\text{(aq)} + \text{NO}_3\ ^-\text{(aq)}}
Consider the following unbalanced equation:
Zn (s) + NO3− (aq) + H+ (aq) → Zn2+ (aq) + NH4+ (aq) + H2O (l)
Write the net ionic and complete molecular reaction
Redox Balance
Consider the unbalanced redox reaction shown below.
IO3− (aq) + HSO3−(aq) → I−(aq) + SO42−(aq) (in acidic solution)
When the equation is balanced with the smallest whole number coefficients, what is the coefficient of SO42− ?