An unknown gas is collected over water at 20ºC when the barometric pressure is 756 torr. The gas collected has a mass of 0.68 g and occupies a volume of 990 mL. The vapor pressure of water under these conditions is 17.54 torr. Which of the following is the likely identity of the gas? NH3
NH, 3

CH4
CH, 4

H2
H, 2

H2S
H, 2, S

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.

Answers are 1,2,4 its correct on edgenuity.