Aluminium + Bromine 個empirical formula係咩? [復制鏈接]

as title
THX

Al3+ , Br-

=> AlBr3

引用第1樓kylau於2006-11-22 13:47發表的“”:
Al3+ , Br-
=> AlBr3

.
今日test條問題比左個mass我,我用左mass/molar mass 來計
錯左7分

mass/molar mass = no. of mole

錯咩?

引用第3樓智者於2006-11-22 20:44發表的“”:
mass/molar mass = no. of mole
錯咩? [表情]

fake我,就咁Al2BR3就得
但我用左mass/molar mass來count ratio

引用第4樓eric_ah4於2006-11-22 20:46發表的“”:
fake我,就咁Al2BR3就得
但我用左mass/molar mass來count ratio

條式冇錯，你用錯方法jei，簡單複雜化~

姐係有Al2BR3架?

no. of mole of bromine used 唔係個mass / 79.9x2 咩

引用第6樓智者於2006-11-22 20:56發表的“”:
姐係有Al2BR3架? [表情]

有empirical formula就未必係有果樣野

例如：
photosynthesis會出 C6H12O6，
而佢既empirical formula就係CH2O，
但係就唔代表世上有CH2O呢樣野