发布网友 发布时间:2022-05-05 04:23
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热心网友 时间:2023-10-09 16:03
(14分) (1)①极性键(或共价键)、离子键 ②吸收热量,保证反应在常温下进行(答“制冷”或“降温”均可) ③4NH3+5O24NO+6H2O NH4NO3(或:*铵) (2)Mg2Si3O8?nH2O + 4HCl = 3H2SiO3+ 2MgCl2+ (n-1)H2O 6 |
试题分析: (1)③4NH3+5O24NO+6H2O 2NO+ O2="2N" O2 3N O2+ H2O= 2HNO3+ NO NH3+ HNO3 = NH4NO3 (白烟) 设Mg2Si3O8?nH2O的物质的量为x (2)HCl + NaOH="NaCl+" H2O Mg2Si3O8?nH2O + 4HCl = 3H2SiO3+ 2MgCl2+ (n-1)H2O 30*0.1*10-3 30*0.1*10-3 1 4 x 50*0.1*10-3 -30*0.1*10-3 x=5*0.1*10-3 MMg2Si3O8?nH2O="m/n=0.184" g/5*0.1*10-3=368(g/mol) n=(368-260)/18=6 |