You see a puddle of water after a rainstorm on an asphalt driveway. As the sun c

Question

You see a puddle of water after a rainstorm on an asphalt driveway. As the sun comes out, the puddle slowly but surely evaporates. Estimating an initial volume of the puddle of around 2 liters and measuring an air temperature of 22 degree C, about how much energy (cal) was needed to evaporate the puddle? a. Less than 1, 000 cal b. Between 1, 000 cal and 5, 000 cal c. Between 5, 000 cal and 25, 000 cal d. Between 25, 000 cal and 50, 000 cal e. Between 50, 000 cal and 100, 000 cal f. Between 100, 000 cal and 500, 000 cal g. Between 500, 000 cal and 1, 000, 000 cal h. More than 1, 000, 000 cal ANSWER: H

Explanation / Answer

2 liter = 2 kg of water approx...

assume latent heat of water at = 2257 kJ/kg at 25°C

so..

Q = mass*LH = 2*2257 = 4514 kJ

1 cal = 4.184 J

Calories --> (4514 *10^3)(4.184) = 18886576 = 18,886,576

answer is H, more than 1million cal

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