CHEMISTRY HIGH SCHOOL

2H2 + O2 ---> 2H2OHow many moles of oxygen (O2) are required to completely react with 27.4 mol of H2?

A.) 6.8 mol
B.) 13.7 mol
C.) 54.8 mol
D.) 109.6 mol

Answers

Answer 1
Answer: 2 H2 + O2 ----------- 2 H2O

2 mol H2 ----------- 1 mol O2
27.4 mol H2- ------ x mol O2

2x  = 27.4

x = 27.4 / 2

x = 13.7 moles O2

answer b

hope this helps!.
Answer 2
Answer:

Answer:

B.) 13.7 mol

Explanation:

Edge 2020

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A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution?

Answers

To solve this we use the equation,

 

M1V1 = M2V2

 

where M1 is the concentration of the stock solution, V1 is the volume of the stock solution, M2 is the concentration of the new solution and V2 is its volume.

 

1.75 M x V1 = 0.100 M x 2.0 L

V1 = -.11 L

Answer : The volume of NH_4NO_3 stock solution is, 0.114 L

Solution :

According to the dilution law,

M_1V_1=M_2V_2

where,

M_1 = molarity of NH_4NO_3 solution = 0.100 M

V_1 = volume of NH_4NO_3 solution = 2.00 L

M_2 = molarity of NH_4NO_3 stock solution = 1.75 M

V_2 = volume of NH_4NO_3 stock solution = ?

Now put all the given values in the above law, we get the volume of NH_4NO_3 stock solution.

(0.100M)* (2.00L)=(1.75M)* V_2

V_2=0.114L

Therefore, the volume of NH_4NO_3 stock solution is, 0.114 L

A rigid cylinder with a movable piston contains 50.0 liters of gas at 30.0 degrees Celsius with a pressure of 1.00 atmosphere. What is the volume of the gas in the cylinder at STP?

Answers

30ºC 

 30 +273 = 303 K

P₁* V₁ / T₁ =  P₂*V₂/ T₂

1.00 * 50.0 = 1 * V₂ / 273

V₂ = 1.00 * 50.0 * 273 / 303 * 1 = V₂

V₂ =13650 / 303

V₂ = 45.0 L

hope this helps!

Lee and Celia are lab partners. While Celia pours a chemical into a graduated cylinder, some of the chemical splashes onto her arm. what should they do next? A. Lee should continue working with Celia after helping wipe off her arm. B. Lee should tell the teacher what happened to Celia when he leaves the lab. C. Lee should tell the teacher while Celia washes her arm with soap and water. D. Lee should have Celia stand in the safety shower while another student tells the teacher.

Answers

I think the best answer from the choices listed above is option C. With this accident, both should be alert and do what should be done.  Lee should tell the teacher while Celia washes her arm with soap and water. Doing this, Celia will prevent the chemical to spread more and harm further. Telling the teacher immediately will also alert the in-charge and do what should be done.

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Answers

Hi! The answer is Energy. I hope this helped, Goodluck :)
my best guess is energy

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Answers

The correct answer should be something like gathering data or similar.

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Answer:

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Answers

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