Sodium-22 has a half-life of 15 hours. How much Sodium-22 will remain in an 18.Og sample after 60 hours? (show all your work to receive full credit.) *​

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but