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Elis [28]
3 years ago
7

Need help how to find the atomic mass?

Chemistry
1 answer:
Usimov [2.4K]3 years ago
4 0

use the formula:

average atomic mass= atomic mass1 × abundance1/100 + atomic mass2 × abundance2/100

62.9296 × 69.15/100 + 64.9278 × 30.85/100=

62.9296 × 0.6915 + 64.9278 × 0.3085=

43.5158 + 20.0302=

63.546 amu

so the answer is 63.546 amu

(the element is europium)

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using the Bohr model for hydrogen: energy = hc/wavelength = 2.18 x 10^-18 Joules (1/nf2 - 1/ni2) N=15 to n=5
soldier1979 [14.2K]

Answer:

Energy lost is 7.63×10⁻²⁰J

Explanation:

Hello,

I think what the question is requesting is to calculate the energy difference when an excited electron drops from N = 15 to N = 5

E = hc/λ(1/n₂² - 1/n₁²)

n₁ = 15

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hc/λ = 2.18×10⁻¹⁸J (according to the data)

E = 2.18×10⁻¹⁸ (1/n₂² - 1/n₁²)

E = 2.18×10⁻¹⁸ (1/15² - 1/5²)

E = 2.18×10⁻¹⁸ ×(-0.035)

E = -7.63×10⁻²⁰J

The energy lost is 7.63×10⁻²⁰J

Note : energy is lost / given off when the excited electron jumps from a higher energy level to a lower energy level

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3 years ago
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