1、 Na2CO3·x H2O —— Na2CO3
106+18x 106
14.3 g 5.3g
( 106+18x )/106=14.3g /5.3g
x=10
2、 并收集到244ml气体的物质的量=0.244L÷22.4L/mol =0.011mol
设CuO的物质的量为X
CuO+H2SO4=CuSO4 +H2O
x x x
Fe+CuSO4=FeSO4 +Cu
x x x
Fe +H2SO4=FeSO4 +H2
1 1
0.011 0.011
因此 x×64g/mol -(x +0.011)×56g/mol =0.24g
x=0.106mol
Cuo粉末的质量=0.106mol*80g/mol=8.5g
------
是否收集到 224ml
气体的物质的量=0.224L÷22.4L/mol =0.01mol
设CuO的物质的量为X
CuO+H2SO4=CuSO4 +H2O
x x x
Fe+CuSO4=FeSO4 +Cu
x x x
Fe +H2SO4=FeSO4 +H2
1 1
0.011 0.011
因此 x×64g/mol -(x +0.01)×56g/mol =0.24g
x=0.10mol
Cuo粉末的质量=0.10mol*80g/mol=8g