The air in a room 16 ft by 12 ft by 12 ft is 3% carbon monoxide. starting at tequals0, fresh air containing no carbon monoxide is blown into the room at a rate of 300 ft cubed/min. if air in the room flows out through a vent at the same rate, when will the air in the room be 0.01% carbon monoxide?

if you mean hydrogen and oxygen then water is the product

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.