Given: 2C8H18 + 25O2 → 16CO2 + 18H2O
In the combustion of octane, how many grams of oxygen are needed to completely react and produce 84.00 grams of carbon dioxide? Use the periodic table to get the weights of the elements.
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the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

b.

the accuracy of the data.

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.

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.