17. The gas-phase reaction of H, with CO2, to produce H2O and CO has delta H = 11 kJ and Delta S= 41 J/K. Is the reaction spontaneous at 298 K?
What is Delta G?

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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.