Two samples of 2.0 L of water are heated by adding 50.0 J of thermal energy to each. Both samples are at the same pressure, 1 atm. What are the possible initial temperatures of the two samples?

You would do 1500/4 and the answer is 375

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.