把4g的Ca加進過量的水中反應生成一氣體
a) 寫出反應的代學方程式
b) 計算生成氣體的質量
a) 我識寫條式
b) 我識計Ca係 0.1 mol , 但係我唔知點計H2係幾多mol....教教我 , 係唔係要係條方程到睇架 ?
Reacting Masses !
2007-06-19 10:43 pm
回答 (1)
2007-06-19 11:05 pm
✔ 最佳答案
(1個 )Ca + H2O ----------> CaO + (1個 ) H2no of mole of Ca = 4g /40.1 (40.1=molecular mass)check table知既
= 0.1
H2O is in excess, therefore use Ca既 no of mole 去計 H2
no. of mole of Ca : no of mole of H2 = 1:1 (from條式而知)
所以no of mole of H2 = 0.1
2007-06-19 16:06:04 補充：
sorry 係 Ca + 2 H2O ----------> Ca(OH)2 + (1個 ) H2no. of mole of Ca : no of mole of H2 = 1:1 (from條式而知)所以no of mole of H2 = 0.1
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