化学molar mass

题目

化学molar mass
1.find the molar mass of the following (hint use the periodic table)
-H -CL2 -Br -N2O4 -Na2S -NH3O -K2So
2.calculate how many moles you would have in the following
-10gH -50gCL2 -100gBr - 20gNa2s
3.calculate the mass of
-2molH -5mplNa2S -3.5molNH3O -1.75molK2SO4

答案

第一个是求摩尔质量 就相当于原子量H2 2g/mol Cl2 71g/mol Br2 160g/mol N2O4 92g/mol Na2S 78g/mol,你是不是题目抄错了NH3 17g/mol K2SO4 174g/mol,第二个是算有多少摩尔 质量/摩尔质量10gH 5mol 50gCL2 0.704mol 1...