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3 years ago

Which of the following best defines one mole of a substance?

1 answer:

4 0

1 mole = 6.022x10²³ of anything. The number 6.022x10²³ is known as Avogadro's number. Avogadro's number is not a mass, it is just a unit of measure. Other units of measure include: 1 pair (2), 1 dozen (12), a baker's dozen (13), et. al. 1 mole is similar in that it simply represents a certain number of things; specifically, Avogadro's number of things.

Since we know 1 mole is not a mass, the first two options can be eliminated. On observing the third option, it cannot be correct because, as we said, 1 mole is equal to Avogadro's number—not an atom of a given substance.

<h3>Answer:</h3>

Amount of substance present in Avogadro's number of particles of the substance

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3 years ago

Calcula el pH de las siguientes sustancias formadas durante una erupción volcánica:

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<em>Calculate the pH of the following substances formed during a volcanic eruption: </em>

<em>• Sulfurous acid if [H +] = 0.10 </em>

<em>• Nitric acid if [H +] = 0.11</em>

<em />

<h3>Further explanation </h3>

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.

pH = - log [H⁺]

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$\tt pH=-log[1.9\times 10^{-5}]\\\\pH=5-log1.9\\\\pH=4.72$

pH Sulfurous acid

$\tt pH=-log[10^{-1}]\\\\pH=1$

pH Nitric acid

$\tt pH=-log[11\times 10^{-2}]\\\\pH=2-log~11=0.959$

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2 years ago