If 1.50 L of 0.780 mol/L sodium sulfide, Na2S, is mixed with 1.00 L of a 3.31
mol/L lead(II) nitrate, Pb(NO3)2,"solution, what mass of precipitate would
you expect to form? The molar mass of PbS is 239.28 g/mol.*

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

a:

by the combination of an unlimited number of elements

answerto predict;