A portable electric water heater transfers 255 watts (W of power to 5.5 L of water, where 1 W=1J/s.How much time (in minutes) will it take for the water heater to heat the 5.5 L of water from 27∘C to 49∘C? (Assume that the water has a density of 1.0 g/mL.

Answer 1

q needed to heat the water is
q in Joules = mass H2O x specific heat H2O x (Tfinal-Tinitial)

Then convert to 255 watts and q in Joules to time.

Answer 2

26 minutes