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Alona [7]
3 years ago
8

Are the orbits of the planets could you pls help!!!! Pls don't send scam links !! in the solar system as they revolve around the

Sun perfectly
circular?
Explain.
Chemistry
1 answer:
11Alexandr11 [23.1K]3 years ago
3 0

Answer: Orbits are elliptical, Sun is in focal point of the ellipse.

Explanation:

Orbits are not perfect circles. Distance of Earth from Sun is between

147 million kilometres - 152 million kilometres. When Earth is in closest point of the Sun it moves faster tant in the point which is most far away from Sun.

Kepler´s Laws give more information.

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Answer:

The percentage abundance of Eu isotopes are 52 %  and 48 % .

Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope,:

% = x %

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For second isotope :

% = 100  - x  

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Given, Average Mass = 151.96 amu

Thus,

151.96=\frac{x}{100}\times {151.0}+\frac{100-x}{100}\times {153.0}

Solving for x, we get that:

x = 52 %

<u>Thus percentage abundance of Eu isotopes are 52 %  and 48 % .</u>

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For 2.50 g of Zn

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