Answer to Question #121904 in General Chemistry for queen

Question

List the following compounds, H2O,CO2,CH4 and H2CO in order from highest to lowest boiling point. EXPLAIN your reasoning *

Answer 1

H2O: 100°C

H2CO: -19°C

CO2: -78,46°C

CH4: -161,5°C

The boiling point of a substance is the temperature at which the vapor pressure from the liquid is equal to the pressure of the surrounding liquid and the liquid turns into vapor.

The boiling point of a liquid varies with the ambient pressure. A liquid in a partial vacuum has a lower boiling point than when this liquid is at atmospheric pressure. A liquid under high pressure has a higher boiling point than when this liquid is at atmospheric pressure. For example, water boils at 100 ° C (212 ° F) at sea level, but at 93.4 ° C (200.1 ° F) at 1.905 m (6250 ft) above sea level. At a given pressure, different liquids will boil at different temperatures.The boiling point of a liquid depends on two factors: from the kind of liquid; from external pressure.

Almost all gases, due to their molecular structure, boil at temperatures below 0 centigrade. Since in order for them to boil, a gas liquefaction process is necessary. This is achieved by cooling the gases.