a. PTHH: 4NH3 + 3O2 ---to---> 2N2 + 6H2O
b. Ta có: \(n_{NH_3}=\dfrac{34}{17}=2\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{3}{4}.n_{NH_3}=\dfrac{3}{4}.2=1,5\left(mol\right)\)
=> \(m_{O_2}=1,5.32=48\left(g\right)\)
Đề cho a : b = 9 : 8
=> \(b=m_{H_2O}=\dfrac{128}{3}\left(g\right)\)