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
NeX [460]
4 years ago
11

A fuel cell differs from a battery because the current is being generated from a reduction-oxidation (redox) reaction in which t

he reactant is consumed. A classic example of a fuel cell is the phosphoric acid fuel cell (PAFC), which have been used in stationary power generators, buses, and even submarines. Fuel cells require an electrolyte (similar to batteries) to carry electrically charged species between the electrodes, and a PAFC utilizes phosphoric acid (H3PO4) as its electrolyte. The weak acid phosphoric acid has three acidic protons, highlighted in red here: H3PO4.
As a weak acid, some of the acid will remain in molecular form when dissolved in water.

Write the net ionic equation that depicts the dissociation of the first proton including charges for any ions produced.
Chemistry
1 answer:
Iteru [2.4K]4 years ago
4 0

Answer:

H₃PO₄(aq) ⇄ H₂PO₄⁻(aq) + H⁺(aq)

Explanation:

The phosphoric acid fuel cell (PAFC) employs phosphoric acid (H₃PO₄), a weak acid that dissociates in 3 steps, each with its acid dissociation constant.

H₃PO₄(aq) ⇄ H₂PO₄⁻(aq) + H⁺(aq)               Ka1

H₂PO₄⁻(aq) ⇄ HPO₄²⁻(aq) + H⁺(aq)              Ka2

HPO₄²⁻(aq) ⇄ PO₄³⁻(aq) + H⁺(aq)                Ka3

You might be interested in
I’m confused because this is the answer key and I don’t know how they got the answer to number 1)
Tems11 [23]

Question One

It's more a question of unscrambling what is there. The answer is correct.

If you look at your periodic table, there is such an element as Na which I suspect might be the problem.

It has an atomic mass of 23. It's atomic number is 11 which means it is the 11th member (by mass) on the periodic table. The other 2 are oxygen and hydrogen.  So Oxygen has an atomic mass of 16 and Hydrogen has an atomic  mass of 1.

Oxygen is number 8 on the periodic table and hydrogen is number 1.

Molecular Mass

Na = 23

O = 16

H = 1

Total 40, just as the answer key says. I've probably given you more than you wanted to know, but if you still have trouble, leave a note.

5 0
3 years ago
Mg(OH)2 + 2 HBr à MgBr2 + 2 H2O
AnnyKZ [126]

Explanation:

The balanced equation of the reaction is given as;

Mg(OH)2 (s) + 2 HBr (aq) → MgBr2 (aq) + 2 H2O (l)

1. How many grams of MgBr2 will be produced from 18.3 grams of HBr?

From the reaction;

2 mol of HBr produces 1 mol of  MgBr2

Converting to masses using;

Mass = Number of moles * Molar mass

Molar mass of HBr = 80.91 g/mol

Molar mass of MgBr2 = 184.113 g/mol

This means;

(2 * 80.91 = 161.82g) of HBr produces (1 * 184.113 = 184.113g) MgBr2

18.3g would produce x

161.82 = 184.113

18.3 = x

x = (184.113 * 18.3 ) / 161.82 = 20.8 g

2. How many moles of H2O will be produced from 18.3 grams of HBr?

Converting the mass to mol;

Number of moles = Mass / Molar mass = 18.3 / 80.91 = 0.226 mol

From the reaction;

2 mol of HBr produces 2 mol of H2O

0.226 mol would produce x

2 =2

0.226 = x

x = 0.226 * 2 / 2 = 0.226 mol

3. How many grams of Mg(OH)2 are needed to completely react with 18.3 grams of HBr?

From the reaction;

2 mol of HBr reacts with 1 mol of Mg(OH)2

18.3g of HBr =  0.226 mol

2 = 1

0.226 = x

x = 0.226 * 1 /2

x = 0.113 mol

5 0
3 years ago
Se disuelven 10 g de acido carbónico H2CO3 en 150 g de agua. Determina la concentración % m/m de esa disolución?
sergey [27]

The question is: 10 g of carbonic acid H2CO3 are dissolved in 150 g of water. Determine the% m / m concentration of that solution?

Answer: The% m / m concentration of that solution is 6.66%.

Explanation:

Given: Mass of solute = 10 g

Mass of solvent = 150 g

Formula used to calculate the %m/m is as follows.

Percent (m/m) = \frac{mass of solute}{mass of solvent} \times 100

Substitute the values into above formula as follows.

Percent (m/m) = \frac{mass of solute}{mass of solvent} \times 100\\= \frac{10 g}{150 g} \times 100\\= 6.66%

Thus, we can conclude that the% m / m concentration of that solution is 6.66%.

6 0
3 years ago
Based on the six given solvents, which of the following answers lists ALL of the solvents that are NOT suitable for liquid-liqui
Zina [86]

Answer:

I don't know the answer sorry

6 0
3 years ago
Chlorine, which has an atomic mass of 35.453 amu, has two naturally occurring isotopes, Cl-35 and Cl-37. Which isotope occurs in
Pachacha [2.7K]

Cl-35 occurs in greater abundance.

The <em>weighted atomic mass</em> lies <em>closer to 35 u</em> than to 37 u, so the Cl-35 isotope must be more abundant.


8 0
3 years ago
Other questions:
  • If you have 125 g of iron, how many grams of iron (iii)oxide will be formed
    12·1 answer
  • Mariah needs to identify a cause-and-effect relationship. Which type of investigation should she use?
    12·1 answer
  • Which is an image of a scintillation counter?
    8·2 answers
  • Write an equation for the hydrogenation of glyceryl trilinolenate, a fat formed from glycerol and three linolenic acid molecules
    11·1 answer
  • A ball is thrown directly up in the air from a height of 5 feet with an initial velocity of 60 ft/s. Ignoring air resistance, ho
    13·2 answers
  • Draw a complete Lewis structure for the conjugate acid of nitromethane that shows all bonds, unshared electron pairs, and minimi
    6·1 answer
  • Label each half cell in this diagram of a voltaic cell to identify which electrode it contains and the process occurring at the
    10·2 answers
  • Describe how the r group in each of the 20 differebt amino acids determines each amino acid's characteristics
    13·1 answer
  • Which type of plant would a gardener most likely plant in a shady area of
    13·2 answers
  • What is the difference between a strong base and a weak base?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!