answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
11111nata11111 [884]
2 years ago
6

Heating copper(II) oxide at 400°C does not produce any appreciable amount of Cu: CuO(s) ⇆ Cu(s) + 1 2 O2(g) ΔG o = 127.2 kJ/mol

However, if this reaction is coupled to the conversion of graphite to carbon monoxide, it becomes spontaneous. Write an equation for the coupled process and calculate the equilibrium constant for the coupled reaction. Be sure to include the states of the chemical species.
Chemistry
2 answers:
Allisa [31]2 years ago
7 0

Explanation:

The reaction is as follows.

          CuS \rightleftharpoons Cu(s) + \frac{1}{2}O_{2}(g)

As, value of \Delta G is positive. Therefore, reaction is non-spontaneous.

     CuO(s) + C(graphite) \rightleftharpoons Cu(s) + CO(g)

     \Delta G = \sum \Delta G_{f}_{product} - \sum \Delta G_{f}_{reactant}

                  = [-137.2 - (127.2 kJ/mol)]

                  = -10 kJ/mol

Since, value of \Delta G is negative here so, reaction is spontaneous.

Also,  \Delta G = -RT ln

where,        R = 8.314 J/mol K

                  T = 400^{o}C = (400 +  273) K = 673 K

                  K = equilibrium constant

       -10 \times 10^{3} J/mol = -8.314 J/mol K \times 673 ln K

           100 = 2.303 \times 8.314 J/mol K \times 673 log K

           log K = 0.00776

              K = 1.018

Therefore, we can conclude that equilibrium constant for the coupled reaction is 1.018.

loris [4]2 years ago
6 0

Answer:

CuO(s)Cu(s)+\frac{1}{2}O_2(g);\Delta G^o_1=127.2kJ/mol \\2C(s)+O_2(g)2CO(s);\Delta G^o_2=-137.16kJ/mol

K=5.93

Explanation:

Hello,

In this case, the coupled process contains the following two chemical reactions:

CuO(s)Cu(s)+\frac{1}{2}O_2(g);\Delta G^o_1=127.2kJ/mol \\2C(s)+O_2(g)2CO(s);\Delta G^o_2=-137.16kJ/mol

By taking the total Gibbs free energy for this coupled reactions:

\Delta G^o_{T}=127.2kJ/mol-137.16kJ/mol=-9.96kJ/mol

In such a way, we compute the equilibrium constant as follows:

K=exp(-\frac{\Delta G^o_{T}}{RT} )=exp(-\frac{(-9960J/mol)}{8.314J/molK*673.15} )\\K=5.93

Best regards.

You might be interested in
How many moles of O are in 2.45 moles of H2CO3?​
Irina-Kira [14]

Answer:

7.35 moles of oxygen

Explanation:

First of all, for 1 mole of H₂CO₃ we have 3 moles of oxygen (can be deduced from the chemical formula of the acid), then the moles of oxygen in 2.45 mole of the compound, which are given in the question, from the carbonic acid will be:  

If in        1 mole of H₂CO₃ we have 3 moles of oxygen

The in    2.45 moles of H₂CO₃ we have X moles of oxygen

X = ( 3 × 2.45 ) / 1 = 7.35 moles of oxygen

3 0
2 years ago
Fill in the blanks with the word that best completes each statement. Scientists develop knowledge by making ------------about th
kotegsom [21]

Answer:

1. observations

2. hypothesis

3. experimentation

Explanation:

Observations are made, Hypothesies are formed from observations, and experimnets help alter and comfirm hypothesis.

3 0
2 years ago
A student is given a sample of CuSO4(s) that contains a solid impurity that is soluble and colorless. The student wants to deter
DochEvi [55]

Answer:

The impurity which is present in the solution of copper sulphate (CuSO4) is determined by the an instrument known as spectrophotometer.

Explanation:

Spectrophotometer is a device or an instrument which is used to determine the concentration of a chemical by measuring the detection of light intensity that is coming from the solution. If the solution of copper sulphate is checked through spectrophotometer, we can can determined or measure the amount of copper sulphate and the impurity in the solution.

3 0
2 years ago
How many valence electrons are in chlorodifluoromethane
Elis [28]
<span>Well... first, let's recognize that the chemical formula for chlorodifluoromethane is CHClF2. Count out how many valence electrons there are. C = 4, H = 1, Cl = 7, F (X2) = 14. Total is 26. Let's put C as the central atom, and put the other elements surrounding it. Draw a pair of electrons beach each element and the central atom. Then fill the halogen elements with 3 pairs of electrons each to fill their octets. Count out how many dots you have. There should be 26, making this the correct lewis structure! Remember, hydrogen doesn't have a full octet, only a maximum of two electrons.</span>
7 0
2 years ago
What does it mean for a backyard ecosystem to have a low diversity
pantera1 [17]
It means there is a lot of the same thing and not many others
3 0
2 years ago
Other questions:
  • In this scenario a battery is used to supply chemical potential energy. The potential energy is transformed and produces kinetic
    7·2 answers
  • What is the molar mass of 56.75 g of gas exerting a pressure of 2.87 atm on the walls of a 5.29 l container at 230 k?
    15·1 answer
  • Water is dissolved into n-butanol (a polar liquid). Which is the second step at the molecular level as water dissolves into n-bu
    8·2 answers
  • What is the number of moles in 15.0 g AsH3?
    12·1 answer
  • Match each decimal number to the correct scientific notation. 30,700 0.000307 0.00000307 3,070,000 3.07 × 10-6 arrowRight 3.07 ×
    12·2 answers
  • How many carbon atoms are contained in 2.8 g of c2h4 ?
    13·2 answers
  • Air in a 0.3 m3 cylinder is initially at a pressure of 10 bar and a temperature of 330K. The cylinder is to be emptied by openin
    11·1 answer
  • Write chemical equations and corresponding equilibrium expressions for each of the two ionization steps of carbonic acid. Part A
    11·1 answer
  • A 2.50 g sample of zinc is heated, and then placed in a calorimeter containing 65.0 g of water. Temperature of water increases f
    6·1 answer
  • Write a hypothesis about the pH level of common household solutions based on what you know about their physical and chemical pro
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!