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3 years ago

Why is an elements atomic mass not listed as a whole number in the periodic table

Chemistry

2 answers:

FinnZ [79.3K]3 years ago

7 0

Answer:

They aren't listed as a whole number, because an atom's mass is not always a whole number. The mass differs between types of atoms as well.

Grace [21]3 years ago

3 0

Answer:

This is because atoms ionize, isotopes exist, and the fact that their are impurities.

Explanation:

Each atomic mass could not be calculated accurately if it was a whole number.

- Hope this helped! Please let me know if you need further explanation.

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AlladinOne [14]

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2 years ago

A 0.187 M weak acid solution has a pH of 3.99. Find Ka for the acid. Express your answer using two significant figures.

Anna35 [415]

Answer:

5.56 × 10⁻⁸

Explanation:

Step 1: Given data

Concentration of the weak acid (Ca): 0.187 M

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Step 2: Calculate the concentration of H⁺

We will use the following expression.

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog -3.99 = 1.02 × 10⁻⁴ M

Step 3: Calculate the acid dissociation constant (Ka)

We will use the following expression.

$Ka = \frac{[H^{+}]^{2} }{Ca} = \frac{(1.02 \times 10^{-4})^{2} }{0.187} = 5.56 \times 10^{-8}$

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Answer:

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