Asample of ammonia (nh3) gas is completely decomposed to nitrogen and hydrogen gases over heated iron wool. if the total pressure is 853 mmhg after the reaction, calculate the partial pressures of n2 and h2. enter your answers in scientific notation.

The partial pressure of N2 and H2 is calculated as below

write the reaction for decomposition of NH3

NH3 =N2 +3 H2

 from the reaction above 1 mole of N2  and 3 moles of H2 is formed and therefore the total mole of the product  = 4

the reaction coefficient for N2 from the reaction = 1/4
and that of H2 = 3/4 

the final pressure = partial pressure of N2  +partial pressure of H2

partial pressure  of N2 = 1/4 x853 mm hg = 213.25 mmhg
partial pressure of H2 = 3/4 x853mm hg=639.75 mm hg