Bài 1:
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(P_2O_5+3H_2O\rightarrow2H_3PO_4\)
\(2H_3PO_4+3Zn\rightarrow Zn_3\left(PO_4\right)_2+3H_2\)
Bài 2:
PT: \(Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\)
\(CaO+H_2O\rightarrow Ca\left(OH\right)_2\)
a, Ta có: \(n_{H_2}=\frac{2,24}{22,4}=0,1\left(mol\right)\)
Theo PT: \(n_{Ca}=n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Ca}=0,1.40=4\left(g\right)\)
\(\Rightarrow m_{CaO}=m_{hh}-m_{Ca}=12-4=8\left(g\right)\)
Bạn tham khảo nhé!