chemistry
posted by help .
* 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

800J = mass x specific heat x (TfinalTinitial). Substitute and solve for sp.h.
721 = mass Cu x sp.h. Cu x delta T.
q = mass H2O x specific heat H2O x (TfinalTinitial)