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How many joules are needed to completely evaporate 25 g of water at 100°C?

1 Answer

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Final answer:

To completely evaporate 25 g of water at 100°C, 56,250 joules of energy are needed.

Step-by-step explanation:

To completely evaporate 25 g of water at 100°C, we need to calculate the amount of heat required using the specific heat formula:

Heat = mass × specific heat × temperature change

Given that the heat of vaporization of water is 2250 J/g, we can substitute the values into the formula:

Heat = 25 g × 2250 J/g × (100°C - 0°C)

Heat = 56,250 J

Therefore, 56,250 joules of energy are needed to completely evaporate 25 g of water at 100°C.

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