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问题 计算题

（5分）在 300 mL 2 mol/L H2SO4溶液中，SO的物质的量浓度是多少？H+的物质的量浓度是多少？溶质的质量是多少？此溶液中含 H+的物质的量是少？其中含有多少个 SO？

答案

2mol/L；4mol/L；58.8g；1.2mol；3.612×1023

考查物质的量的有关计算。

c(SO)= c(H2SO4)=" 2" mol/L；

c(H+)= 2 c(H2SO4)=" 4" mol/L；

溶质即 H2SO4，由于n (H2SO4) =" 0.3" L×2 mol/L =" 0.6" mol，

所以m(H2SO4) =" 98" g/mol×0.6 mol =" 58.8" g；

n(H+)= 2n(H2SO4)=" 1.2" mol；

n(SO)=" 0.6" mol，

根据可知

N(SO)=" 0.6" mol×6.02×1023 mol－1 = 3.612×1023。

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