1answer.
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
sergey [27]
3 years ago
13

Calculate the theoretical carbonaceous and nitrogenous oxygen demand for:

Chemistry
1 answer:
serg [7]3 years ago
5 0

Answer:

The correct answer is 129 mg and 232 mg.

Explanation:

Theoretical carbonaceous oxygen demand:

The reaction will be,  

C₂H₆O₂ + 5/2 O₂ ⇒ 2CO₂ + 3H₂O

Thus, for one mole of C₂H₆O₂ (ethylene glycol), 2.5 moles of O₂ is needed.  

The molecular mass of ethylene glycol is 62 grams per mole.  

The given mass of ethylene glycol is 100 mg or 0.1 grams

The moles of ethylene glycol will be,  

Moles = Weight/Molecular mass

= 0.1/62 = 1.613 × 10⁻³ mol

For 1.613 × 10⁻³ mol, the moles of O₂ will be,  

= 2.5×1.613×10⁻³

= 4.0.×10⁻³ × 32mol

= 0.129 grams or 129 mg.  

The theoretical nitrogenous oxygen demand is:  

The reaction will be,  

2NH₃-N + 9/2O₂ ⇒  4HNO2 + H₂O

Thus, for 2 moles of NH₃-N, 4.5 moles of O₂ is needed,  

Therefore, for 1 mol of NH₃-N, the oxygen required will be,  

= 4.5/2 = 2.25 mol

The given mass of NH₃-N is 100 mg, the moles of NH₃-N will be,  

Moles = 100×10⁻³/31 = 3.225 × 10⁻³ mol (The molecular mass of NH₃-N is 31 gram per mole)

The moles of O₂ is 2.25 × 3.225 × 10⁻³ = 7.258 × 10⁻³ mol.  

Now the mass of O2 will be,  

= 7.258 × 10⁻³ × 32

= 0.232 grams

= 232 mg

You might be interested in
Which of the following indicates that a chemical reaction system has reached equilibrium?
navik [9.2K]
D) if stuff is changing then the reaction is hardly in equilibrium is it? Everything is just chilling at equilibrium so there would be constant concentration
4 0
3 years ago
How many moles of copper are needed to react with sulfur to produce 0.25 moles Ol
Tems11 [23]

Answer:

                       0.50 moles of Cu

Explanation:

                    The balanced chemical equation for given synthetic reaction is,

                                          2 Cu + S → Cu₂S

According to balance chemical equation,

                  1 mole of Cu₂S is produced by  =  2 moles of Cu

So,

          0.25 moles of Cu₂S will be produced by  =  X moles of Cu

Solving for X,

                      X  =  0.25 mol × 2 mol /  1 mol

                      X  =  0.50 moles of Cu

Hence, as the molar ratio of Cu to Cu₂S is 2:1 hence, to produce 0.25 moles of Cu₂S we will need 0.50 moles of Cu.

6 0
3 years ago
What is one takeaway you have about future sea levels rising ?
Galina-37 [17]

Answer:

Our world will never be the same. Our beaches will be submerged, many towns, cities, states, and even countries will be partially if not completely submerged. All these human cities being flooded will kill thousands of people, pollute the ocean, and lose billions of dollars.

Explanation:

7 0
2 years ago
Read 2 more answers
A Shade or mixture of shades made when light reflects off something
dmitriy555 [2]
Luster is the term- means the shininess of the metal
3 0
3 years ago
A generator makes electricity from _____.
marysya [2.9K]

Answer: kinetic energy

Explanation: searched it up

6 0
3 years ago
Read 2 more answers
Other questions:
  • What is the best example of electromagnetic energy in everyday life
    10·2 answers
  • On the periodic table, the majority of elements are classified as
    10·2 answers
  • How did Mendeleev's work help in the discovery of new elements ?
    9·2 answers
  • Which way of representing a molecule best shows its three-dimensional shape?
    15·1 answer
  • A total of 0.829 L of hydrogen gas is collected over water at 33.0°C. The total pressure is 794 torr.
    14·1 answer
  • Ethanol has a density of 0.79g/mL what is the volume, in quarts, of 1.50 kg of ethanol?​
    8·2 answers
  • Calculate the density in g/cm3 for the mass of 452.1g and volume of 292cm3
    11·1 answer
  • How many grams of CaCI2 (molar mass = 111 g/mol) are needed to prepare 100.mL of 0.100 M CI-(aq) ions?
    13·1 answer
  • How many moles are in 2.3x1024 g of Ag?<br> Plz help!!
    8·1 answer
  • If you have an altitude of 55 mi. (miles), which layer of the atmosphere are you in?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!