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③放电过程中氢离子的作用是__和_；充电时若转移的电子数为3．01*1025个，左槽溶液中n（H2）的变化量为______．

A.01*1025个，左槽溶液中n（H2）的变化量为________．

【参考答案】

③参与正极反应，通过交换膜定向移动使电流通过溶液；0．5mol

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