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Chemical formula of copper (II) nitrate
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Chemical formula of copper (II) nitrate

User Endunry
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It would be Cu(NO3)2. The NO3 has a negative charge. Copper has a positive 2. In order to have a stable compound, you would need 2 NO3s, which is why there is a 2 outside of the NO3. I hope this helps.
User Sander Marechal
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