50mL a 1M HCl solution is titrated with a 0.50M NaOH solution A) 1M HCl solution is titrated with a 0.50M NaOH solution.

B) Calculate the volume of the NaOH solution needed to reach the equivalence point.

your answer would be a. 12.5 kg

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.