There are three isotopes of X element (X):

Chemistry

1 answer:

Nutka1998 [239]3 years ago

8 0

Answer:

Average atomic mass = 17.5 amu.

Explanation:

Given data:

X-17 isotope = atomic mass17.2 amu, abundance:78.99%

X-18isotope = atomic mass 18.1 amu, abundance 10.00%

X-19isotope = atomic mass:19.1 amu, abundance: 11.01%

Average atomic mass of X = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass = (78.99×17.2)+(10.00×18.1) +(11.01+ 19.1) /100

Average atomic mass = 1358.628 + 181 +210.291 / 100

Average atomic mass = 1749.919 / 100

Average atomic mass = 17.5 amu.

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slava [35]

Answer:

Answer D

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A piece of brass is found to have a mass of 24.32 g. When placed in a graduated cyclinder with an initial reading of 5.60 mL the

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Answer:

$\rho=3.1g/mL$

Explanation:

Hello,

In this case, considering that the density of a body is computed given its mass and volume:

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Taking into account that the mass is 24.32 g and the volume is computed via the difference between the volume of the water with the brass and the volume of water by itself as follows:

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