"Cuando se quema un papel sucede que las cenizas obtenidas tienen menor masa que este¿Cómo representarias esta reacción y el cumplimiento de la ley de conservación de
la masa con ecuaciones químicas?".

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.

The think of process to make something successful