51问答网 > 50克过氧化氢溶液和3克二氧化锰充分反应后，剩余物质52.2克，则产生氧气的质量是 _____ 克

50克过氧化氢溶液和3克二氧化锰充分反应后，剩余物质52.2克，则产生氧气的质量是 _____ 克

2025-03-15 05:07:43
推荐回答（1个）
回答1：

减少的质量是生成O2的质量，是50+3-52.2=0.8g
设过氧化氢溶液溶质的质量为x。
2H2O2=MnO2=2H2O+O2↑
68 32
x 0.8g

68/x=32/0.8
x=1.7g
H2O2的物质的量n=m/M=1.7/34=0.05mol
溶质的质量分数=1.7/50*100%=3.4%

答：生成O2的质量是0.8g
（1）参加反应的过氧化氢的物质的量是0.05mol
（2）过氧化氢溶液溶质的质量分数是3.4%

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