在潜水艇中常用过氧化钠(Na2O2)吸收入呼出的二氧化碳并产生氧气

在潜水艇中常用过氧化钠(Na2O2)吸收入呼出的二氧化碳并产生氧气,供给人的呼吸.其反应的化学方程式为:2Na2O2+2CO2═2Na2CO3+O2.若潜水艇中携带有8吨含杂质2.5%(杂质不参加反应)的过氧化钠(Na2O2),理论上可产生氧气多少吨?

答案

【考点】根据化学反应方程式的计算.

【分析】由样品质量和过氧化钠的质量分数,根据过氧化钠与二氧化碳反应的化学方程式可以计算出生成氧气的质量.

【解答】解:设理论上能产生氧气的质量为x.8吨含杂质2.5%(杂质不参加反应)的过氧化钠(Na2O2)中过氧化钠=8t×(1﹣2.5%)=7.8t

2Na2O2+2CO2=2Na2CO3+O2

156                                 32

7.8t                                  x

x=1.6t

答案:理论上能产生氧气1.6吨.

【点评】本题主要考查含杂质物质的化学方程式计算,难度稍大.

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