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Formal charge in compound ions is calculated by subtracting unshared electrons and half of shared electrons from valence electrons. Read more:
https://explainedchem.wordpress.com/2024/01/31/moles-course-11/
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The number 0.042 has two significant figures (4 and 2), and it has two leading zeros. Whereas, 0.420 has three significan figures (4, 2, and 0), with one leading zero and one trailing zero. Click link to learn more about significant figures, leading and trailing zeros. Click link to read more:
https://explainedchem.wordpress.com/2023/12/06/moles-course-7/
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