Part a
enter three nuclear equations to represent the nuclear decay sequence that begins with the alpha decay of 235 92u (uranium-235) followed by a beta decay of the daughter nuclide and then another alpha decay. express your answers as nuclear reactions separated by commas.
part b
enter the nuclear equation for the positron emission of _{11}^{22}\textrm{na} (sodium-22).
express your answer as a nuclear reaction.
part c
enter the nuclear equation for electron capture in _{36}^{76}\textrm{kr} (krypton-76).
express your answer as a nuclear reaction

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

pv=nrt

explanation: