Espresso is a coffee beverage made by forcing steam through finely ground coffee beans. modern espresso makers generate steam at very high pressures and temperatures, but in this problem we'll consider a low-tech espresso machine that only generates steam at 100? c and atomospheric pressure--not much good for making your favorite coffee beverage.
the amount of heat q needed to turn a mass m of room temperature ( t1) water into steam at 100? c ( t2) can be found using the specific heat c of water and the heat of vaporization hv of water at 1 atmosphere of pressure.
suppose that a commercial espresso machine in a coffee shop turns 1.50 kg of water at 22.0? c into steam at 100? c. if c=4187j/(kg? ? c) and hv=2,258kj/kg, how much heat q is absorbed by the water from the heating resistor inside the machine?
assume that this is a closed and isolated system.
express your answer in joules to three significant figures.
q = j