Homework Help: chemistry

Posted by help on Tuesday, December 11, 2012 at 5:23pm.

* A 50 gram sample of an unknown metal warms from 18 to 58 after absorbing 800 joules of energy. what is the specific heat of the metal?

*copper has a specific heat of 0.387 j/g degree celsius. what is the mass of a piece of copper that undergoes a
21.0 C temperature change when it absorbs 721 J of energy?

*How many joules of energy must be absorbed to raise the temperature of 21 grams of water from 25 C TO 30 C

chemistry - DrBob222, Tuesday, December 11, 2012 at 8:14pm
800J = mass x specific heat x (Tfinal-Tinitial). Substitute and solve for sp.h.

721 = mass Cu x sp.h. Cu x delta T.

q = mass H2O x specific heat H2O x (Tfinal-Tinitial)

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