17.2gCaSO4·xH2O转换成2CaSO4·(x-1)H2O时质量减少2.7g,则x为多少?
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![17.2gCaSO4·xH2O转换成2CaSO4·(x-1)H2O时质量减少2.7g,则x为多少?](/uploads/image/z/8370127-55-7.jpg?t=17.2gCaSO4%C2%B7xH2O%E8%BD%AC%E6%8D%A2%E6%88%902CaSO4%C2%B7%EF%BC%88x-1%EF%BC%89H2O%E6%97%B6%E8%B4%A8%E9%87%8F%E5%87%8F%E5%B0%912.7g%2C%E5%88%99x%E4%B8%BA%E5%A4%9A%E5%B0%91%3F)
17.2gCaSO4·xH2O转换成2CaSO4·(x-1)H2O时质量减少2.7g,则x为多少?
17.2gCaSO4·xH2O转换成2CaSO4·(x-1)H2O时质量减少2.7g,则x为多少?
17.2gCaSO4·xH2O转换成2CaSO4·(x-1)H2O时质量减少2.7g,则x为多少?
2
可以用常识来解答 CaSO4是石膏的组成之一 根据生石膏(CaSO4·2H2O)熟石膏(2CaSO4·H2O)可知道x=2
由题意可得化学方程式:
2CaSO4·xH2O====2CaSO4·(x-1)H2O + (x+1)H2O
2(136+18x) 18(x+1)
17.2 2.7
列出方程: 2(136+18x):17.2=18(x+1):2.7
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由题意可得化学方程式:
2CaSO4·xH2O====2CaSO4·(x-1)H2O + (x+1)H2O
2(136+18x) 18(x+1)
17.2 2.7
列出方程: 2(136+18x):17.2=18(x+1):2.7
(272+36x)×2.7=(18x+18)×17.2
734.4+97.2x=309.6x+309.6
212.4x=424.8
所以 x=2
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