Question

calculeaza volumul NH3 in c.n degajat in urma reactiei dintre azot si oxigen cu masa de 3,5 g

Answer 1

N2 +3H2 = 2NH3
calculam cantitatea de H2
n(H2) = 3.5g/ 2g/mol = 1.75 mol 
calculam cantitatea de subs.de NH3 obtinut dupa reactie
n(NH3) = 1.75 mol * 2 mol / 3 mol = 1.16 mol
aflam V (NH3)
V(NH3) = 0.16 mol * 22.4l/mol = 25.984 l