Chemistry help- amount of energy needed to heat water? - Freemason Hirams Travels Masonic Forums

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02-29-2008, 07:51 PM

nagelangel523

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Chemistry help- amount of energy needed to heat water?

Of course I was absent the day we learned this, but I'm not sure how to do some problems, so if you could help me set it up, so I know where the numbers come from.

Calculate the amount of energy needed in calories to heat 145 g of water from 22.3 degrees celsius to 75.0 degrees celsius. (water in j/g degree celsius = 4.184, cal/ g degree celsius = 1)

Calculate the energy needed in joules to heat 25.0 g of gold from 120 degrees celsius to 155 degrees celsius ( gold in j/g degrees celsius = 0.14 and cal/g degrees celsius = 0.033)

I have a few more problems, but hopefully I'll be able to do it on my own. Thanks so much!!

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