Question 2.14: Determining Names and Formulas of Binary Covalent Compounds ......

Chemistry The Molecular Nature of Matter and Change With Advanced [1125936]

Determining Names and Formulas of Binary Covalent Compounds

Problem (a) What is the formula of carbon disulfide?

(b) What is the name of $PCl_5$ ?

(c) Give the name and formula of the compound whose molecules each consist of two N atoms and four O atoms.

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Solution (a) The prefix di- means “two.” The formula is $CS_2$ .
(b) P is the symbol for phosphorus; there are five chlorine atoms, which is indicated by the prefix penta-. The name is phosphorus pentachloride.
(c) Nitrogen (N) comes first in the name (lower group number). The compound is dinitrogen tetroxide, $N_2O_4$ .

Comment Note that, as the first elements in the name, carbon in (a) and phosphorus in (b) do not have the prefix mono-. In (c), the a at the end of the Greek prefix is dropped when the prefix is added to -oxide. Similarly, “hexa-oxide” becomes hexoxide, “deca-oxide” becomes decoxide, and so forth.

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