The synthesis of sodium chloride occurs according to the reaction: Na + Cl₂ > NaCl. Using the balanced equation, what volume of chlorine gas at STP is necessary for the complete reaction of 6.35 grams of sodium metal.

you need to give more information

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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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.