Question

Problem page ammonia nh3 chemically reacts with oxygen gas o2 to produce nitric oxide no and water h2o . what mass of oxygen gas is consumed by the reaction of 6.3g of ammonia?

Answer 1

The  mass  of  oxygen  consumed  is  calculate  as   follows
write  the equation  for  reaction

4NH3   + 5O2  =  4NO +  6H2O
calculate  the  moles  of  ammonia =mass/molar  mass

=    6.3 g/ 17  g/mol= 0.37moles
by  use  of  mole  ratio  between  NH3  to  O2    which  is  4:5  the  moles  of  O2  is  therefore=  0.37  x5/4 = 0.463 moles

mass of  O2  consumed  is therefore  = moles   xmolar mass
=  0.463 moles  x   32  g/mol=  14.82 grams