Gypsum is hydrated calcium sulfat,CaSO4·xH2O.A residue of 5.

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Gypsum is hydrated calcium sulfat,CaSO4·xH2O.A residue of 5.65g of anhydrous calcium sulfate is obtained by heating 7.15g gypsum.Determine the empirical formula of gypsum
不用翻译……
尤其是拿翻译软件翻译的……这个太。咳咳
要得是怎么写这个题~

write out the equation first,assume that the number of water is x.
CaSO4.xH2O(136+18x)=CaSO4(136)+xH2O(18x)
无水硫酸钙和x水和硫酸钙的差量为7.15-5.65=1.50g,所以水的质量就是1.5g
列方程
136/5.65=18x/5.0
解得x=2.0
the expirical formula of gypsum is CaSO4.2H2O

Gypsum is hydrated calcium sulfat,CaSO4·xH2O.A residue of 5. Only residue a little sad.,This is Sulfat 某实验小组做测定硫酸钙晶体CaSO4· xH2O中X值的实验 17.2g CaSO4·xH2O转变成2CaSO4·(x-1)H2O时,质量减少2.7g,则x值是多少用守恒法怎么算啊 calcium 17.2gCaSO4·xH2O转换成2CaSO4·（x-1）H2O时质量减少2.7g,则x为多少? 某实验兴趣小组做测定硫酸钙晶体CaSO4·xH2O中X值的实验：将硫酸钙晶体放在坩埚中加热,至少不再含结晶水 Fe2O3·xH2O中的"·xH2O"是什么意思? Calcium is found most abundantly in milk. Fe2O3·xH2O RT CaSO4·2H2O