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MaRussiya [10]
3 years ago
14

What is the overall energy transformation in a coal-fired power plant?.

Chemistry
1 answer:
polet [3.4K]3 years ago
7 0

Answer: When coal is burned, chemical potential energy is transformed into thermal energy, light energy, and sound energy. Only the thermal energy is used for electricity production. Light and sound energy dissipate into the environment, immediately reducing efficiency.

Hope this helps.

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Which diagram shows a pair of electrons that have opposite spins?
Nastasia [14]

It's B ------------------------------------

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3 years ago
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If 38.5 grams of potassium react with excess oxygen gas, how many grams of potassium oxide can be produced? 4K + O2 yields 2K2O
Lera25 [3.4K]

Answer:

46.40 g.

Explanation:

  • It is a stichiometric problem.
  • The balanced equation of the reaction: 4K + O₂ → 2K₂O.
  • It is clear that 4.0 moles of K reacts with 1.0 mole of oxygen produces 2.0 moles of K₂O.
  • We should convert the mass of K (38.5 g) into moles using the relation:

<em>n = mass / molar mass,</em>

n = (38.5 g) / (39.098 g/mol) = 0.985 mole.

<em>Using cross multiplication:</em>

4.0 moles of K produces → 2.0 moles of K₂O, from the stichiometry.

0.985 mole of K produces → ??? moles of K₂O.

∴ The number of moles of K₂O produced = (0.985 mole) (2.0 mole) / (4.0 mole) = 0.4925 mole ≅ 0.5 mole.

  • Now, we can get the mass of K₂O:

∴ mass = n x molar mass = (0.5 mole) (94.2 g/mol) = 46.40 g.

6 0
3 years ago
A sample of gas starts at 1.00 atm, 0.00 degrees Celsius, and 30.0 mL. What is the
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Answer:

pV= nRT

Explanation:

(p1 × V1)/ T1/ (p2 × V2)/ T2

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2 years ago
Which of the following statements is subjective? Van Gogh painted beautiful works of art. The planets revolve around the sun. Bl
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The "Van Gogh" one is subjective, because it expresses opinion and is not a true, hard fact. :)
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In a second-order reaction (one that is second order in one reactant), cutting in half the concentration of that reactant will h
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A second order reaction varies with the square of the concentration of the reactant. Therefore, halving the concentration will reduce the rate of reaction by a factor of 4.
The answer is E.
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