Question

TÍnh lượng oxi cần dùng để đốt cháy hết:

a) 46,5gam Photpho

b) 67,5gam nhôm

c) 33,6 lit hidro

Answer 1

a) \(n_P=\frac{46,5}{31}=1,5\left(mol\right)\)

\(4P+5O2-->2P2O5\)

1,5--------1,875(mol)

\(m_{O2}=1,875.32=60\left(g\right)\)

b) \(n_{Al}=\frac{67,5}{27}=2,5\left(mol\right)\)

\(4Al+3O2-->2Al2O3\)

2,5-------1,875(mol)

\(mO2=1,875.32=60\left(g\right)\)

c)\(n_{H2}=\frac{33,6}{22,4}=1,5\left(mol\right)\)

\(2H2+O2-->2H2O\)

1,5----0,75(mol)

\(m_{O2}=0,75.32=24\left(g\right)\)