题目

填写下列空白： (1)含有6.02×1023个H的H2O，其物质的量是________mol；某硫酸钠溶液中含有3.01×1023个Na+，则溶液中SO42-的物质的量是 ____________mol，该溶液中Na2SO4的质量为 ______________g。 (2)_____________mol H2O中含有的氧原子数与1.5 mol CO2中含有的氧原子数相等。 (3)将等物质的量的NH3和CH4混合，混合气体中NH3与CH4的质量比为______________。 (4)已知16gA和20gB恰好完全反应生成0.04molC和31.76gD，则C的摩尔质量为 ________。I got to love Hangzhou ______ I went there in 2001 and that was the first time that I ______Longjing TeA． A．the first time; had tasted    B．for the first time; had tasted    C．the first time; have tasted   D．for the first time; tasted