. How many joules of energy must be absorbed to raise the temperature of 20 grams of water from 25°C to 30°C?

1 Answer
Apr 29, 2018

Raising the temperature of liquids is an endothermic process, so we need to put energy into the system.

Recall,

#q = mC_sDeltaT#

Where,

#C_s = (4.18"J")/(°"C")#

Hence, we must put approximately,

#q = mC_sDeltaT = 4.2*10^2"J"#

of energy into your given mass of water to raise it by #5°"C"#.

This is commonly accomplished by "heating" water.