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2H2O===2H2+O2 同溫同壓下氣體的分子數之比就是體積比. 氫氣與氧氣的分子數比為2:1,則生成的氫氣是氧氣體積的2倍了. 為10mL
5毫升的氧氣,因為電解方程式:H2O==O2+2H2 至於質量嘛,根據化學方程式算就行啦,8/9a
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