Asample of br2(g) takes 48.0 min to effuse through a membrane. how long would it take the same number of moles of ar(g) to effuse through the same membrane?

From the periodic table:
mass of Br = 79.9 grams
mass of Ar = 39.9 grams
Therefore,
molar mass of Ar = 39.9 grams
molar mass of Br2 = 2(79.9) = 159.8 grams

Now,
time for Ar / time for Br2 = sqrt(molar mass of Ar / molar mass of Br2)
time for Ar = 48 * sqrt(39.9 / 158.9)
time for Ar = 24.0528 minutes

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.