Gypsum is hydrated calcium sulfat,CaSO4·xH2O.A residue of 5.65g o_英语解答

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~

人气：101 ℃　时间：2020-05-24 22:30:51

解答

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