Question

write the cemical formula of the following compounds (use criss-cross method)
1. aluminium oxide
2. ammonium sulphate
3. cuprous chloride
4. ferric sulphate
5.lead (ll) hydroxide
6. silver bromide
7. calcuim carbonate​

Answer 1

Answer:

While a nitrate molecule has only one valence electron. We need 2 nitrate molecules to satisfy the valency of 1 copper atom. We can apply the criss-cross method for this compound as, Therefore, the chemical formula of magnesium chloride is Cu(NO3)2.

Answer 2

See this one

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