Which statement is true if the AHrxn of a reaction is positive?
The reaction is endothermic.
The reaction is exothermic.
There is more reactant than product.
There is more product than reactant.
O
O

i believe it is 40–40–20%

explanation:

i would say b

explanation:

but i think i would need more information than that

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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.