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Usimov [2.4K]
3 years ago
7

Beryllium is in Group 2. What does this tell you about the electronic structure of beryllium?

Chemistry
1 answer:
Alexus [3.1K]3 years ago
7 0

Answer:

[He] 2s²

Explanation:

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Chlorine concentration in a municipal water supply is a uniformly distributed random variable that ranges between 0.76 ppm and 0
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With that information you can calculate the mean or average.

Given that it is uniformly distributed in that range, it means that the function is symmetrical around the mean, i.e. the mean is at the center of the distribution => mean = (0.99 + 0.76) / 2  = 0.875
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There are 6.022 x 10^23 atoms of Hg in 1 mole of Hg. The number of atoms in 4.5 moles of Hg can be found by multiplying 4.5 by 6
serious [3.7K]

Answer:

D. 27.099 x 10²³.

Explanation:

  • It is known that every 1.0 mole of an atom contains Avogadro's no. (6.022 x 10²³) atoms.

<em>So, 4.5 mol of Hg will contain:</em>

(4.5 mol)(6.022 x 10²³) = 27.099 x 10²³ atoms.

<em>So, the right choice is: D. 27.099 x 10²³.</em>

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4 years ago
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N analyst prepared a sucrose solution by weighing 1kg of water and add 1.5kg sucrose.estimate the concentration of the resultant
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The concentration of the solution in mass percent is 60%.

<h3>What is the mass percent?</h3>

The concentration of a substance can be expressed in mass percent. This refers to the percentage of the solute that is contained in the solution.

Thus we can write;

Mass percent = Mass of solute/ Mass of solution * 100/1

Mass percent = 1.5kg/1.5kg + 1 Kg * 100/1

Mass percent =  60%

Hence, the concentration of the solution in mass percent is 60%.

Learn more about mass percent:brainly.com/question/5394922

#SPJ1

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