The normal boiling point of a liquid isQuestion 6Select one:the temperature at which the gas molecules have more kinetic energy than the molecules in the liquid.the temperature above which the substance cannot exist as a liquid regardless of the pressure.the temperature at which the liquid will usually boil.the temperature at which the vapour pressure equals 101.3 kPathe only temperature at which there can be equilibrium between liquid and gas.
Question
The normal boiling point of a liquid isQuestion 6Select one:the temperature at which the gas molecules have more kinetic energy than the molecules in the liquid.the temperature above which the substance cannot exist as a liquid regardless of the pressure.the temperature at which the liquid will usually boil.the temperature at which the vapour pressure equals 101.3 kPathe only temperature at which there can be equilibrium between liquid and gas.
Solution
The normal boiling point of a liquid is the temperature at which the vapour pressure equals 101.3 kPa.
Here's why:
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The boiling point of a liquid is the temperature at which its vapor pressure equals the external pressure.
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In most common scenarios, this external pressure is the atmospheric pressure at sea level, which is 101.3 kPa.
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Therefore, the normal boiling point is the temperature at which the vapor pressure of a liquid equals the atmospheric pressure at sea level (101.3 kPa).
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At this temperature, the liquid starts to boil and transform into a gas.
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This is not the only temperature at which there can be equilibrium between liquid and gas. Equilibrium can exist at any temperature where the rate of evaporation equals the rate of condensation.
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It's also not the temperature above which the substance cannot exist as a liquid regardless of the pressure. A substance can exist as a liquid above its boiling point under high pressure conditions.
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Lastly, it's not the temperature at which the gas molecules have more kinetic energy than the molecules in the liquid. The kinetic energy of molecules increases with temperature, but it's not directly related to the boiling point.
Similar Questions
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