250 g of potassium nitrate and 150 g of sodium nitrate are dissolved in water at 60°C to make 1000 g of solution. How many grams of each solid will precipitate if the solution is cooled to 0°C?

You know how the first one if filled up like the objects do the same but with the other categories

60.0 - there are 3 significant numbers

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.