化学求带过程解!how many liters of hydrogen gas will be produced at

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化学求带过程解!how many liters of hydrogen gas will be produced at 280K and 96kPa if 40g.
急!how many liters of hydrogen gas will be produced at 280K and 96kPa if 40g of sodium react with excess water

用40除以23求得钠的摩尔量,钠与水出氢气,钠与氢气摩尔比2比一,再用气体状态方程求体积,OK?
再问：请问钠与氢气摩尔比二比一怎么来的…
再答：。。。。。。最直白的表述是钠丢失1个电子变正一价，氢气2个氢离子各自得到一个电子变0价，所以2mol钠产生1mol氢气

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