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GenaCL600 [577]
3 years ago
13

How many grams of silver chromate, Ag2CrO4, are produced from 57.7

Chemistry
1 answer:
Anastasy [175]3 years ago
5 0
48.3 g AgNO3 / 169.9 g/mol = 0.284 moles AgNO3
0.284 mol AgNO3 X (1 mol Ag2CrO4/2 mol AgNO3) = 0.142 mol Ag2CrO4
0.142 mol Ag2CrO4 X 331.7 g/mol = 47.1 g Ag2CrO4
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A radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. What was the identity of the original nucleus?
Rudik [331]
Answer:

<span>2813Al</span>

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You know that alpha decay takes place when a α-particle is being ejected from the nucleus of a radioactive isotope.An 

<span>α-particle</span> is simply the nucleus of a helium-4 atom. A helium-4 atom has a total of two protons and two neutrons in its nucleus, and two electrons surrounding that nucleus.

In that case, if a <span>α-particle</span> is the nucleus of a helium-4 atom, then it must have a mass number equal to 4, since it has two protons and two neutrons, and a net charge of <span>(2+)</span> since it no longer has the two electrons that the helium-4 atom has.

So, you know that an unknown radioactive isotope decays via alpha decay to yield a sodium-24 nucleus.

A sodium-24 nucleus contains 11 protons and 13 neutrons. This means that you can write

<span><span>AZ</span>X→<span>2411</span>Na+<span>42</span>α</span>

Here A and Z represent the unknown element's mass number and atomic number, respectively.

So, if you take into account the fact that mass number and atomic number must be conserved in a nuclear reaction, you can say that

<span>A=24+4 </span> and <span> Z=11+2</span>

The unknown isotope will thus have

<span>{<span><span>A=28</span><span>Z=13</span></span></span>

A quick look at the periodic table will show you that the element that has 13 protons in its nucleus is aluminum, Al. This means that you're dealing with aluminum-28, an isotope of aluminum that has 15 neutrons in its nucleus.

The complete nuclear equation will be

<span><span>2813</span>Al→<span>2411</span>Na+<span>42</span><span>α
</span></span>

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1. How is the number of energy levels in an atom related to the period number?
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