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3 years ago

Another science question because i dont know it so i need more help

Chemistry

1 answer:

horsena [70]3 years ago

4 0

Answer: Would be C

Explanation: It would be c because all the others aren’t true and it’s easier to study so you know the awnser btw

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The first step in HNO3 production is the catalyzed oxidation of NH3. Without a catalyst, a different reaction predominates:

alexira [117]

Answer:

Kc = 6x10⁻⁶

Explanation:

For the reaction:

4NH₃(g) + 3O₂(g) ⇄ 2N₂(g) + 6H₂O(g)

Kc is defined as:

Kc =[N₂]² [H₂O]⁶ / [NH₃]⁴ [O₂]³

The equilibrium concentrations of the gases is -Because volume of the container is 1.00L-:

[N₂] = 2X = 1.96x10⁻³; X = 9.8x10⁻⁴

[H₂O] = 6X; 6ₓ9.8x10⁻⁴ = 5.88x10⁻³

[NH₃] = 0.0150M - 4X = 0.01108M

[O₂] = 0.0150M - 3X = 0.01206M

Replacing in Kc expression:

Kc =[1.96x10⁻³]² [5.88x10⁻³]⁶ / [0.01108M]⁴ [0.01206M]³

8 0

4 years ago

Calculate the heat absorbed by a sample of water that has a mass of 45.00 g when the temperature increases from 21.0oC to 38.5 o

Elenna [48]

Answer:

The heat absorbed by the sample of water is 3,294.9 J

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

The sensible heat of a body is the amount of heat received or transferred by a body when it undergoes a temperature variation (Δt) without there being a change of physical state (solid, liquid or gaseous). Its mathematical expression is:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Q=?
m= 45 g
c= 4.184 $\frac{J}{g*C}$
ΔT= Tfinal - Tinitial= 38.5 C - 21 C= 17.5 C

Replacing:

Q= 4.184 $\frac{J}{g*C}$ * 45 g* 17.5 C

Solving:

Q=3,294.9 J

The heat absorbed by the sample of water is 3,294.9 J

8 0

3 years ago

Energy must be added to an atom to move a electron from a lower to a higher energy level. This is known as ___________

Phoenix [80]

Answer:

The excitation energy

Explanation:

Excitation energy is the energy needed move an electron from a lower energy level (usually the ground state) to one of higher energy (an excited state).

6 0

4 years ago

What is the potential energy of the reactants from the following energy diagram?

slavikrds [6]

The potential energy of the reactants is 200J.
From the energy diagram, the energy of the product formed is 350J; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

5 0

3 years ago

Read 2 more answers

Matter with no definite shape or volume

MAVERICK [17]

Answer:

Gases have no definite shape or volume.

7 0

3 years ago