Question

..надо назвать соединения: 1)Na3N 2) Mg(NO2)2 3) Na4P2O7 4) Al(PO3)3 5) CaHPO4

Answer 1

1. нитрид натрия
2.нитрит магния
3.пирофосфат натрия
4.метафосфат алюминия
5.гидроортофосфат кальция

Answer 2

I can help you with naming chemical compounds. Here are the names of the compounds you asked for:

1) Na3N - натрий нитрид (sodium nitride) 2) Mg(NO2)2 - магний нитрит (magnesium nitrite) 3) Na4P2O7 - натрий пирофосфат (sodium pyrophosphate) 4) Al(PO3)3 - алюминий метафосфат (aluminum metaphosphate) 5) CaHPO4 - кальций гидрогенфосфат (calcium hydrogen phosphate)

These names are based on the rules for naming ionic and molecular compounds. You can learn more about these rules from [this article](https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/names-and-formulas-of-ionic-compounds/a/polyatomic-ions) or [this exercise](https://www.chegg.com/homework-help/questions-and-answers/exercise-practice-naming-ionic-molecular-compounds-fill-questions-name-formula-compound-gi-q51470926). also has some examples of naming compounds. I hope this helps you.