Question

What volume of ammonia gas, NH3, in liters is produced at stp by the complete reaction of 100 g of nitrogen N2, with excess hydrogen? N2 + 3H2 ---> 2NH3

Answer 1

Molar mass of `N_2->28" g/mol"`

So 100 g `N_2=(100g)/(28g/"mol")=100/28mol=25/7mol`

The equation of the reaction is

`N_2+3H_2->2NH_3`

The stochiometry of this equation reveals that 1 mol `N_2` produces 2 moles `NH_3`having volume `2xx22.4L` at STP ( when reacted with excess `H_2`)

So 100g or.`25/7" mol " N_2` produces `25/7molxx2xx22.4L/"mol"NH_3`
`=160" L "NH_3`