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DENIUS [597]
3 years ago
6

Which mathematical statement correctly relates qsys and qsurr? A. qsys = qsurr B. qsys < qsurr C. qsys > –qsurr D. qsys =

–qsurr
Chemistry
1 answer:
tatiyna3 years ago
4 0

Answer:

  • <u><em>Option D. qsys = - qsurr</em></u>

Explanation:

The symbol q is used to denote heat energy.

Considering positive the heat absorbed and negative the heat released:

  • <em>qsys</em> is the heat absorbed by the systme

  • <em>qsurr</em> is the heat absorbed by the surroundings

When the system does not do work on or receive work from the surroundings, the first law of thermodynamics states that:

  • <em>qsys </em>+ <em>qsurr</em> = 0

From which:

  • <em>qsys = - qsurr ← </em>answer

That is the option D.

That means that, the heat abosorbed by the system (if <em>qsys</em> is positive) equals the heat released by the surroundings, or the heat released by the system (if <em>qsys</em> is negative) equals the heat absorbed by the surroundings.

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Answer:

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Explanation:

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3 years ago
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Nady [450]

Answer:

0.17 moles

Explanation:

In the elements of the periodic table, the atomic mass = molar mass. <u>Ex:</u> Atomic mass of Carbon is 12.01 amu which means molar mass of Carbon is also 12.01g/mol.

In order to find the # of moles in a 12 g sample of NiC-12, we will need to multiply the number of each atom by its molar mass and then add the masses of both Nickel and C-12 found in the periodic table:

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Since there's just one atom of both Carbon and Nickel, we just add up the masses to find the molar mass of the whole compound of NiC-12.

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There's 12g of NiC-12, which is less than the molar mass of NiC-12, so the number of moles should be less than 1. In order to find the # of moles in NiC-12, we need to do some dimensional analysis:

  • 12g NiC-12 (1 mol of NiC-12/70.7g NiC-12) = 0.17 mol of NiC-12
  • The grams cancel, leaving us with moles of NiC-12, so the answer is 0.17 moles of NiC-12 in a 12 g sample.

<em>P.S. C-12 or C12 just means that the Carbon atom has an atomic mass of 12amu and a molar mass of 12g/mol, or just regular carbon.</em>

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Answer:

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Explanation:

6 0
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Answer:

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Explanation:

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