Students must answer this question in full. Show all logic, equations, values, units and sig figs. Melamine (C3N3(NH2)3) is a component of many adhesives and resins and is manufactured in a two-step
process from urea (CO(NH2)2) as the sole starting material. How many moles of urea would be required if we
want to collect 1.00 kg of melamine and if the first step in the process is 100% yield, but the second step is only
65% yield?
(1) CO(NH2)2 (1) ► HNCO(1) + NH3(g) (balanced)
(2) HNCO(1) → C3N3(NH2)3 (1) + CO2(g) (unbalanced)

h let me think

distance, luminosity, brightness, radius, chemical composition, and temperature

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.