Equal volumes of ethanol and hexane are heatedto their boiling points using the
ID: 75286 • Letter: E
Question
Equal volumes of ethanol and hexane are heatedto their boiling points using the same constant heat source. Ittakes 20s to vaporize 3.0g of hexane and 50s to vaporize 3.0g ofethanol.If 2.75kJ are needed to vaporize 3.0g of ethanol. How much energyis needed to vaporize 3.0g of hexane? Equal volumes of ethanol and hexane are heatedto their boiling points using the same constant heat source. Ittakes 20s to vaporize 3.0g of hexane and 50s to vaporize 3.0g ofethanol.
If 2.75kJ are needed to vaporize 3.0g of ethanol. How much energyis needed to vaporize 3.0g of hexane?
Explanation / Answer
Since it is known to be a constant heat source, the units of theheat source can be considered to be energy/time or kJ/sec. If ittakes 2.75 kJ and 50 s to vaporize 3.0 g of ethanol, then the heatsource is emitted energy at a rate of 2.75 kJ/50 sec or 0.055kJ/sec. If it takes 20 sec to vaporize 3.0g of hexane, then ittakes 0.055 kJ/sec * 20 sec or 1.1 kJ
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