Which two of the following are considered vapors? 1. Carbon dioxide 2. Nitrogen 3. Oxygen 4. Water
a. 1 and 3 c. 2 and 3
b. 1 and 4 d. 2 and 4
ANS: B
A vapor is the gaseous form of any substance that can exist as a solid or a liquid at ordinary tem-perature and pressure. Water and dry ice (CO2) can exist as a liquid or a solid at room tempera-ture; N2 and O2 cannot.
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