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標題:
chemf.4題
發問:
The formula for hydrated iron (II) sulphate is FeSO4?xH2O. On strong heating, 20.1 g of the sulphate produces 9.1 g of water. What is the value of x? (Relative atomic masses: H=1.0, O=16.0, S=32.1, Fe=56.0) A. 5. B. 6. C. 7. D. 8. ans.係c 比steps我唔該哂。﹏。
最佳解答:
先寫化學方程 水佔的百分比9.1 / 20.1 x 100% =45.2736% 水佔的摩爾百分比 18x / (56+32.1+16x4+18x)=0.452736 18x = 68.86 + 8.149x 9.851x = 68.86 x = 6.99 x太約係7
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