An “instant cold pack” contains water and an inner pouch with 46.9 g of KNO,. When the inner pouch is
broken and all of the KNO, is completely dissolved in water, the dissolving process absorbs 16.2 kJ of energy
(which “feels cold”). Calculate molar heat of solution (AH ) for this process in kJ/mol of KNO,.
" include correct sig figs, units, AND correct + or - sign

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.

Density= mass/volume so 5.1 divided by 4.7 is  5.1 / 4.7 =1.08510638298round to the correct number of sig figs