Question

The electric heater in a tea kettle delivers 1050W to the water. If the kettle contains 0.9L of water initially at room temperature (20) degrees celcisus, what's the time until the water begins boiling?

Answer 1

u'll have 2 add up the heats req.d ... first the water absorbs enough energy to get elevated to a temp. of 100 degrees (use Q=(mass)(sp.heat of water) *(delta)Temp.) and the this 100 degrees water absorbs further heat (latent heat of vapourisation) to convert to vapour. (use Q=mL(mass*latent heat of vap.)does this help???