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djyliett [7]
4 years ago
5

A person is starting to run to get in shape. How would this runner’s time to complete a 10K race compare with that of a typical

runner who has trained?
A) The time would be about the same.
B) The time would be longer.
C) The time would be shorter.
D) The time and the distance would be longer.
Chemistry
1 answer:
Alexus [3.1K]4 years ago
7 0

someone who has trained and is used to running will complete the 10k race faster than someone who just started running and not in as good of shape. They are both running a 10k race so the distance will be the same.

your answer should be

B) the time would be longer

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Given: 2H2O2 → 2H2O + O2 structure of H2O2: H–O–O–H Bond Bond Energy (kJ/mol) O–H 459 O=O 494 O–O 142 Based on the given bond en
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Answer:

B. - 210 kJ

Explanation:

<em>∵ ΔHrxn = ∑(bond energies)products - ∑(bond energies)reactants.</em>

  • The bond formation in the products releases energy (exothermic).
  • The bond breaking in the reactants requires energy (endothermic).

The products:

  • H₂O contains 2 O-H (- 459 kJ/mol) bonds.
  • O₂ contain 1 O=O (- 494 kJ/mol) bond.

The reactants:

  • H₂O₂ contain 2 O–H (459 kJ/mol) bonds and 1 O–O (142 kJ/mol) bond.

∵ ΔHrxn = ∑(bond energies)products - ∑(bond energies)reactants.

<em>∴ ΔHrxn = [2 (2 x (O–H bond energy) + (1 x (O=O bond energy)] - 2 [(2 x (O–H bond energy) + (1 x (O–O bond energy)] </em>= [2 (2 x - 459 kJ/mol) + (1 x - 494 kJ/mol)] - 2 [(2 x 459 kJ/mol) + (1 x 142 kJ/mol)] = (- 2330 kJ) + (2120 kJ) = <em>- 210 kJ.</em>

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3 years ago
Write a balanced chemical equation that describes an acid-base reaction that would allow you to determine the moles of aspirin p
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A balanced equation representing the acid-base reaction that allows the calculation of the moles of aspirin in a sample is

C_{9} H_{8}O_{4} + NaOH⇒ C_{9} H_{7}O_{4} Na+ H_{2} O

Aspirin, also known as acetylsalicylic acid, is a nonsteroidal anti-inflammatory drug used to reduce pain, fever, and/or inflammation, and as an antithrombotic.

Aspirin is a benzoic acid with an ortho-substituted acylated alcohol function (actually a phenol). Therefore, two reactions can occur when aspirin and NaOH are combined: In fact, several aspirin formulations contain this ingredient.

Hence, A balanced equation representing the acid-base reaction that allows the calculation of the moles of aspirin in a sample is

C_{9} H_{8}O_{4} + NaOH⇒ C_{9} H_{7}O_{4} Na+ H_{2} O

To know more about Aspirin, here : brainly.com/question/23878261

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