Question 51 pts A breathalyzer is a device used to estimate the blood alcohol content of a suspected drunk driver by measuring the amount of alcohol in one's breath. The fuel cell breathalyzer employs the reaction below: CH3CH2OH(g)+O2(g)→HC2H3O2(g)+H2O(g) When a suspected drunk driver blows his or her breath through the fuel-cell breathalyzer, the device measures the current produced by the reaction and calculates the percent alcohol in the breath. How many moles of electrons are transferred per mole of ethanol, CH3CH2OH, in the reaction?

Answers

Answer 1
Answer:

Answer:

Four moles of electrons

Explanation:

The reactions in a breathalyzer are redox reactions. Fuel cell breathalyzers consists of fuel cells with platinum electrodes. The current produced depends on the amount of alcohol in the breath. Detection of alcohol involves the oxidation of ethanol to ethanoic acid. The two half cells set in the process are;

Anode;

C2H5OH(aq) + 4OH^-(aq) ----------> CH3COOOH(aq) + 3H2O(l) + 4e

Cathode;

O2(g) + 2H2O(l) +4e--------> 4OH^-(aq)

Hence four electrons are transferred in the process.


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What is the mass of ammonium nitrate in 250 mL of a 75% by mass solution (density = 1.725 g/mL)?

I need to find the answer for
_ ML = 8,000,000 L

Answers

Answer:

To find the value of the blank in the equation "_ ML = 8,000,000 L," you can simply fill in the blank with a number:

"_ ML = 8,000,000 L" can be filled in as "8,000 ML = 8,000,000 L."

So, the answer is 8,000 ML.

Culled from AI

An alloy is a mixture of metals to obtain a more durable and strongersubstance.
True
False

Answers

Answer: False

Explanation: Alloys are harder and stronger because the different-sized atoms of the mixed metals make the atomic layers less regular, so they cannot slide as easily.

A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = −320.1 kJ/mol and ΔS = −86.00 J/K · mol. Determine the temperature (in °C) below which the reaction is spontaneous.

Answers

Answer:

This reaction is spontaneous for temperature lower than 3722.1 Kelvin or 3448.95 °C

Explanation:

Step 1: Data given

ΔH = −320.1 kJ/mol

ΔS = −86.00 J/K · mol.

Step 2: Calculate the temperature

ΔG<0 = spontaneous

ΔG= ΔH - TΔS

ΔH - TΔS  <0

-320100 - T*(-86) <0

-320100 +86T < 0

-320100 < -86T

320100/86 > T

3722.1 > T

The temperature should be lower than 3722.1 Kelvin (= 3448.9 °C)

We can prove this with Temperature T = 3730 K

-320100 -3730*(-86) <0

-320100 + 320780  = 680 this is greater than 0 so it's non spontaneous

T = 3700 K

-320100 -3700*(-86) <0

-320100 + 318200  = -1900 this is lower than 0 so it's spontaneous

The temperature is quite high because of the big difference between ΔH and ΔS.

This reaction is spontaneous for temperature lower than 3722.1 Kelvin or 3448.95 °C

The standard free energy change for a reaction in an electrolytic cell is always:_________ a. Positive
b. Negative
c. Zero
d. Impossible to determine

Answers

Answer: The standard free energy change for a reaction in an electrolytic cell is always positive.

Explanation:

Electrolytic cells use electric currents to drive a non-spontaneous reaction forward.

Relation of standard free energy change and emf of cell

\Delta G^o=-nFE^0_(cell)

where,

\Delta G^o = standard free energy change

  n= no of electrons gained or lost

F= faraday's constant

E^0_(cell) = standard emf

E^0_(cell)   = standard emf = -ve  , for non spontaneous reaction

Thus  \Delta G^o=(-ve)(-ve)=+ve

Thus standard free energy change for a reaction in an electrolytic cell is always positive.

Energy travels in what direction?

Answers

Final answer:

Energy spreads from its source in various ways depending on the type of energy. Heat travels through conduction, convection, and radiation, while mechanical energy like sound travels in waves.

Explanation:

In general, energy travels in all directions from its source depending on its type. For instance, heat energy propagates in a pattern called conduction, convection, or radiation. In conduction, it travels through the material in direct contact, like a metal spoon in a hot soup. Convection is the transfer of energy through fluids and gases, like warm air rising. While in radiation, energy moves in all directions in the form of electromagnetic waves, think sunlight or microwave radiation.

In the case of mechanical energy like sound, energy moves in waves outwards from a source, like sounds waves spreading after a drum is struck.

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Final answer:

Energy travels in different ways depending on the context, which includes methods like conduction, convection, and radiation. Energy can also be transferred through work and it propagates in the direction of electromagnetic waves. In a star, energy transport is primarily through electromagnetic radiation and can travel in any direction.

Explanation:

Energy travels in different ways depending on the context. It can move through conduction, convection, and radiation. In conduction, energy transfers through molecules colliding with one another. In convection, energy gets transported through the currents of warm material rising towards cooler layers. In radiation, energy is conveyed through the movement of energetic photons from the hot material that gets absorbed by another material.

In addition, energy can be transferred through work, where a force exerted on an object in the direction of the object's motion transfers the energy. This can be seen when lifting a briefcase, where the exerted force does work on the briefcase, transferring energy to it. Furthermore, in the context of electromagnetic radiation, energy also propagates in the direction of the waves, where shorter, tighter waves carry more energy compared to longer, stretched-out waves.

Inside a star, unless convection occurs, the significant mode of energy transport is through electromagnetic radiation. In this case, a photon absorbed while traveling outward in a star might be radiated back toward the center of the star or towards its surface, indicating that energy can travel in any direction.

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What is an extensive property that can be calculated?

Answers

Answer: The property which depends on the quantity of the substance is called an extensive property. The free energy change for a reaction (Δ G) depends on the quantity of the substance and is therefore an extensive property. It shows the additive nature. The extensive property Δ G is easily calculated from the formula, ΔG = -nFE cell.

Explanation:

Final answer:

An extensive property is one that changes when the size of the sample changes. One such property that can be calculated is enthalpy. Enthalpy can be calculated using the formula H = E + PV.

Explanation:

An extensive property is a property that changes when the size of the sample changes. Examples include mass, volume, length, and total charge. One extensive property that can be calculated is enthalpy.

The enthalpy of a system can be calculated using the formula H = E + PV, where H represents the enthalpy, E the internal energy of the system, P the pressure, and V the volume. Like other extensive properties, the enthalpy of a system would change with the quantity or size of the sample.

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