Question

Laead nitrate can be decomposed by heating. what is the percent yiled of the decomposed reaction is 9.9g pb(no3)2 is heated to give 5.5 g pbo

Answer 1

2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

m(Pb(NO₃)₂)=9.9 g
m'(PbO)=5.5 g

the theoretical mass of lead oxide is:
m(PbO)=M(PbO)*m(Pb(NO₃)₂)/M(Pb(NO₃)₂)

the percent yiled of lead oxides is:
w=m'(PbO)/m(PbO)=m'(PbO)M(Pb(NO₃)₂)/M(PbO)*m(Pb(NO₃)₂)

w=5.5*331.2/(223.2*9.9)=0.824 (82.4%)