Thermochemistry Calculations?

Question

If the specific heat of water is 4.184 J/g.C degrees, how much energy is needed to raise the temperature of a 50 gram sample of water 12 degrees C?

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Answer 1 · 2018-05-08T22:16:06

#3000J# or #3kJ#

Use #q = mcDeltaT# for equations like these.
#q# = Energy/heat
#m# = Mass
#c# = Specific Heat
#DeltaT# = Change in temperature.

Insert your values, and you are given:

#q = "50g" * "4.184J/g°C" * 12°C#

Our grams and °C cancel out:

#q = 50 * "4.184J" * 12#

#q = 2510.4J#

After applying sig figs, we get 3000J, or 3kJ of energy.