# chemistry

how many joules of energy are needed to change 275 g of water from 15 degrees C to steam at 100 degrees C

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1. please tell me if this is set up right (275g)(4.184J/1 g Degree C)(85Degrees C)

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2. You have half of it right. The other half you have ignored.
q1 = heat needed to raise T of water from 15C to 100 C is what you have calculated.

q2 = heat needed to change T of water at 100 C to steam at 100 C.
That is q2 = mass H2O x heat vaporization.

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