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3 years ago

Which is an example of a compound?

Chemistry

1 answer:

makkiz [27]3 years ago

5 0

Answer:

Octane - Formula: C8H^18 = Carbon^8 + Hydrogen^18

Explanation: Octane is a compound because there are 8 atoms of carbon and 18 atoms of hydrogen in one molecule of C8H18. There are also 8 moles of carbon and 18 moles of hydrogen.

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Uranium-238 decays to lead-206 with a half-life of 4.5 x 109 yr. Determine how much uranium-238 decays in milligrams (to three s

Mamont248 [21]

Answer:

2.15 mg of uranium-238 decays

Explanation:

For decay of radioactive nuclide-

$N=N_{0}.(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}$

where N is amount of radioactive nuclide after t time, $N_{0}$ is initial amount of radioactive nuclide and $t_{\frac{1}{2}}$ is half life of radioactive nuclide

Here $N_{0}=4.60 mg$ , $t=4.1\times 10^{9}yr$ and $t_{\frac{1}{2}}=4.5\times 10^{9}yr$

So, $N=(4.60mg)\times (\frac{1}{2})^{\frac{4.1\times 10^{9}}{4.5\times 10^{9}}}$

so, N = 2.446 mg

mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg

3 0

3 years ago

How many kilocalories are needed to vaporize 5.8 mol of Br2

Valentin [98]

<span>The vaporization of br2 from liquid to gas state requires 7.4 k/cal /mol.</span>

8 0

2 years ago

What is the standard value for T in the common form of the Nernst equation?

LuckyWell [14K]

52° Celsius

Hope this helped!

6 0

3 years ago

Amino acid Is a compound that contains at least

Lubov Fominskaja [6]

They contain Carbon, Nitrogen, Hydrogen, Oxygen, and Sulfur

4 0

2 years ago

Which type of element is not likely to react chemically with other elements to form a compound?

blsea [12.9K]

Answer:

The noble gases with complete outermost shell electrons.

Explanation:

Noble gases or inert gases do not react chemically with other elements because they have a complete configuration of their electronic shells. What drives chemical reaction is simply the exchange of electrons between two or more atoms. It can be a loss, a gain or simple sharing of electrons in order to achieve a complete configuration just like those of noble gases.

5 0

3 years ago