Question

how can i obtain the formula of phosphurus pentoxide by cris croos method ?​

Answer 1

Answer:

The simple answer is, “You don’t.”

The simple answer is, “You don’t.”You use the criss-cross method for simple ionic or “ionic-like” compounds; that is, compounds composed of a metal and an anion (i.e., either a simple monoatomic anion or a polyatomic anion). What you listed in your question is a “molecular” or “covalent” compound composed of two NON-metals, in which electrons are better shared between atoms. Consequently, we don’t generally assign specific charges to the non-metal atoms in the name. The rules for nomenclature of these compounds are different, and are actually ridiculously simple. The IUPAC name for P2O5 is diphosphorus pentoxide. It LITERALLY tells you “2 (di-) phosphorus atoms and 5 (penta-) oxygen atoms.” No criss-cross is necessary; just simply reading the formula from the name itself.

The simple answer is, “You don’t.”You use the criss-cross method for simple ionic or “ionic-like” compounds; that is, compounds composed of a metal and an anion (i.e., either a simple monoatomic anion or a polyatomic anion). What you listed in your question is a “molecular” or “covalent” compound composed of two NON-metals, in which electrons are better shared between atoms. Consequently, we don’t generally assign specific charges to the non-metal atoms in the name. The rules for nomenclature of these compounds are different, and are actually ridiculously simple. The IUPAC name for P2O5 is diphosphorus pentoxide. It LITERALLY tells you “2 (di-) phosphorus atoms and 5 (penta-) oxygen atoms.” No criss-cross is necessary; just simply reading the formula from the name itself.Criss-cross is useful for ionic (i.e., metal-containing) compounds such as iron (III) sulfate or osmium (VIII) chromate. In the former case, we are told that the iron is a +3 cation, and we know that sulfate is always a -2 anion. Criss-cross tells us to first use the whole numbers of one charge to tell us how atoms of the OTHER are in the molecule. That would give us 2 Fe & 3 SO4 groups, or Fe2(SO4)3. The second step of the criss-cross method is to simplify our whole numbers, if possible. In this case, 2 & 3 are already simplified.

The simple answer is, “You don’t.”You use the criss-cross method for simple ionic or “ionic-like” compounds; that is, compounds composed of a metal and an anion (i.e., either a simple monoatomic anion or a polyatomic anion). What you listed in your question is a “molecular” or “covalent” compound composed of two NON-metals, in which electrons are better shared between atoms. Consequently, we don’t generally assign specific charges to the non-metal atoms in the name. The rules for nomenclature of these compounds are different, and are actually ridiculously simple. The IUPAC name for P2O5 is diphosphorus pentoxide. It LITERALLY tells you “2 (di-) phosphorus atoms and 5 (penta-) oxygen atoms.” No criss-cross is necessary; just simply reading the formula from the name itself.Criss-cross is useful for ionic (i.e., metal-containing) compounds such as iron (III) sulfate or osmium (VIII) chromate. In the former case, we are told that the iron is a +3 cation, and we know that sulfate is always a -2 anion. Criss-cross tells us to first use the whole numbers of one charge to tell us how atoms of the OTHER are in the molecule. That would give us 2 Fe & 3 SO4 groups, or Fe2(SO4)3. The second step of the criss-cross method is to simplify our whole numbers, if possible. In this case, 2 & 3 are already simplified.In the latter example (osmium (VIII) chromate), we are told that osmium is a +8 cation and we know that chromate is always a -2 anion. That gives us an initial formula of Os2(CrO4)8, we can divide both numbers by 2 to get the final formula of Os(CrO4)4.

Explanation:

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