Problem: (a) What is the formula of carbon disulfide?
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(b) What is the name of PCl5 ?
(c) Give the name and formula of the compound formed from two N atoms and four O atoms.
Solution:
(a) The prefix ìdi-î means ìtwoî. The formula is CS2 .
(b) P is the symbol for phosphorus; there are five chlorine atoms, which requires the prefix ìpenta-.î The name is phosphorus pentachloride.
(c) N comes first in the name (lower group number). The compound is dinitrogen tetraoxide, N2O4 .
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