How many moles of nh3 are necessary to produce 0.824 mol n2

1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.

Explanation:

According to reaction 1 mole of nitrogen gas is produced by 2 moles of ammonia.

Then, 0.824 moles of nitrogen gas will be produced by:

1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.

the answer would be b i believe

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.