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
irinina [24]
3 years ago
14

Hydrogen gas is a non polluting fuel hydrogen gas may be prepared by electrolysis of water. 2 H20 (l) --> 2H2(g) +O2(g) Predi

ct the signs of delta H and Delta S for the production of hydrogen gas by electrolysis of water
a. delta h > 0 and delta S >0
b.delta h <0 and delta S >0
c.delta H >0 and delta S <0
d. delta h <0 and delta s <0
e. delta H=0 and delta s <0
Chemistry
1 answer:
goldfiish [28.3K]3 years ago
6 0
I think the correct answer from the choices listed above is option B. The correct signs for <span>delta H and Delta S for the production of hydrogen gas by electrolysis of water would be that </span><span>delta h <0 and delta S >0. Hope this answers the question.</span>
You might be interested in
How many moles of methane (CH4) are in 7.31 x 10^25 molecules
Ivan

molar mass of methane CH4

= C + 4 H  

= 12.0 + 4 x 1.008

= 12.0 +  4.032

= 16.042g/mol

7.31 x 10^25 molecules x <u>             1 mole  CH4    </u>  = 121.43 moles

                                       6.02 x 10^23 CH4 molecules

121.43 moles CH4 are present.

       


6 0
3 years ago
Read 2 more answers
wo reactions and their equilibrium constants are given. A + 2 B − ⇀ ↽ − 2 C K 1 = 2.57 2 C − ⇀ ↽ − D K 2 = 0.226 A+2B↽−−⇀2CK1=2.
Papessa [141]

<u>Answer:</u> The value of equilibrium constant for the net reaction is 11.37

<u>Explanation:</u>

The given chemical equations follows:

<u>Equation 1:</u>  A+2B\xrightarrow[]{K_1} 2C

<u>Equation 2:</u>  2C\xrightarrow[]{K_2} D

The net equation follows:

D\xrightarrow[]{K} A+2B

As, the net reaction is the result of the addition of first equation and the reverse of second equation. So, the equilibrium constant for the net reaction will be the multiplication of first equilibrium constant and the inverse of second equilibrium constant.

The value of equilibrium constant for net reaction is:

K=K_1\times \frac{1}{K_2}

We are given:

K_1=2.57

K_2=0.226

Putting values in above equation, we get:

K=2.57\times \frac{1}{0.226}=11.37

Hence, the value of equilibrium constant for the net reaction is 11.37

6 0
3 years ago
When 25.0 g of ch4 reacts completely with excess chlorine yielding 45.0 g of ch3cl, what is the percentage yield, according to c
Ber [7]

Taking into account definition of percent yield, the percent yield for the reaction is 57.08%.

<h3>Reaction stoichiometry</h3>

In first place, the balanced reaction is:

CH₄ + Cl₂ → CH₃Cl + HCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

  • CH₄: 1 mole
  • Cl₂: 1 mole
  • CH₃Cl: 1  mole
  • HCl:  1 mole

The molar mass of the compounds is:

  • CH₄: 16 g/mole
  • Cl₂: 70.9 g/mole
  • CH₃Cl: 50.45 g/mole
  • HCl:  36.45 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

  • CH₄: 1 mole ×16 g/mole= 16 grams
  • Cl₂: 1 mole ×70.9 g/mole= 70.9 grams
  • CH₃Cl: 1 mole ×50.45 g/mole= 50.45 grams
  • HCl: 1 mole ×36.45 g/mole= 36.45 grams

Mass of CH₃Cl formed

The following rule of three can be applied: if by reaction stoichiometry 16 grams of CH₄ form 50.45 grams of CH₃Cl, 25 grams of CH₄ form how much mass of CH₃Cl?

mass of CH_{3} Cl=\frac{25 grams of CH_{4}x 50.45grams of CH₃Cl }{16 grams of CH_{4}}

<u><em>mass of CH₃Cl= 78.83 grams</em></u>

Then, 78.83 grams of CH₃Cl can be produced from 25 grams of CH₄.

<h3>Percent yield</h3>

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield=\frac{actual yield}{theorical yield}x100

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

Percent yield for the reaction in this case

In this case, you know:

  • actual yield= 45 grams
  • theorical yield= 78.83 grams

Replacing in the definition of percent yields:

percent yield=\frac{45 grams}{78.83 grams}x100

Solving:

<u><em>percent yield= 57.08%</em></u>

Finally, the percent yield for the reaction is 57.08%.

Learn more about

the reaction stoichiometry:

brainly.com/question/24741074

brainly.com/question/24653699

percent yield:

brainly.com/question/14408642

#SPJ1

5 0
2 years ago
A radar gun records the speed of a projectile to be 120.090 m/s. How many significant digits are present in this measurement?
Olegator [25]

Answer:

6

Explanation:

Significant figures:

The given measurement have six significant figures 120.090.

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.

Zero between the non zero digits are consider significant like 104 consist of three significant figures.

The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.

In 120.090 the zero before and after 9 are also significant.

7 0
3 years ago
Which gas law (choices are Charles' Law, Gay-Lussac's Law, or Boyle's Law) explains each scenario:
Sedaia [141]

Explanation:

Air bags help lessen injuries in an automobile crash is application of Boyle's law:

Boyle's law states that at constant temperature, the volume of given mass of a gas is directly proportional to the pressure changes.

According to this law, the volume of the air bag will increase. The bag will become bigger as a result of decrease in the gas pressure in the bag.

The bag was packed with gases under high pressure and their volume decreases appreciably. After a collision, pressure reduces and the gas expands.

helium balloon decreases in size when you put it into a freezer

A can of spray paint will explode if tossed into a fire

Both are application of Charles's law:

 According to this law "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".

The helium balloon decreases in size because the temperature is lowered. The particles will keep tending towards a state of rest.

A can spray paint explodes because the gas in it will keep expanding as the temperature increases in a fire.

learn more:

Charles's law brainly.com/question/7316997

#learnwithBrainly

6 0
3 years ago
Other questions:
  • HELPPPPP NEED FOR ESSAY Vicente is going to spend the afternoon in his yard. He has the choice to get in the pool, lay on a cott
    10·2 answers
  • What happens to a magnetic field if the current carrying wire A has three times as many loops but the same current as the curren
    9·2 answers
  • What carries electric current from the cell to the other components of a circuit.​
    6·1 answer
  • . Find the mass of 0.159 mol silicon dioxide.​
    14·1 answer
  • What is radiation?
    13·2 answers
  • Water covers over 70% of planet Earth and most of the water is salt water. Which
    12·1 answer
  • Explain how the isotopes and ions of an atom differ.
    12·1 answer
  • What happens to the average kinetic energy when a solid is warming up?
    15·1 answer
  • Edpuzzle
    11·1 answer
  • SO2+02➡SO3 <br>balance chemical equation​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!