Chemistry: The atoms in barium metal are arranged in a bodycentered cubic unit cell. Calculate the radius of a barium atom if the density of barium is 3.50 g?cm23 . Hint: Use your answer to Exercise 4.18.

The atoms in barium metal are arranged in a bodycentered

Ответ:

asiamuhammad6

20.01.2022

Chemistry

The radius of a barium atom is r = 2.19 $\times$ 10^-8

Explanation:

The atomic weight of barium is 137.34.

The body-centered cubic structure has two atoms per unit cell.

Therefore, the mass of Ba in a unit cell is calculated as,

m = $\frac{2 \times 137.34}{6.023 \times 10^2^3}$

$m = 4.56 \times 10^{-22} g$

volume = mass / density

$= \frac{4.56 \times 10^{-22} }{3.50}$

volume = $1.30 \times 10^{-22} cm^3$

The edge length of a cube then is the cube root of $1.30 \times 10^{-22} cm^3$ or

$a = 5.06 \times 10^{-8}$

The body diagonal is 4 x the radius and equals a 1.732,

Therefore r = (a $\times$ 1.732) / 4

= (5.06 $\times$ 10^-8

$r = 2.19 \times10^{-8}$

The radius of a barium atom is $r = 2.19 \times10^{-8}$ cm.

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Ответ:

amandasantiago2001

27.06.2022

Chemistry

A. 1

Explanation:

The higher you get in the atmosphere the cooler the temperature will be. The reason it's actually colder is because, as you go up in the atmosphere, the Earth's atmosphere feels less pressure the higher up you go. So as the gas in the atmosphere rises it feels less pressure, which makes it expand.

Hope this Help :)

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The atoms in barium metal are arranged in a bodycentered cubic unit cell. Calculate the radius of a barium atom if the density of barium is 3.50 g?cm23 . Hint: Use your answer to Exercise 4.18.

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