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標題: 幫幫忙CHEM數一條 [打印本頁]

作者: kin~仔 時間: 09-3-31 01:59 AM 標題: 幫幫忙CHEM數一條

In an experiment, 21.8g of zinc was treated with 250.0cm^3 of 20M hydrochloric acid. What volume of hydrogen was liberated at room temperature and pressure?
(relative atomic mass:Zn=65.4;molar volume of gas at room temperatutre and pressure=24dm^3)
Ans:6.0dm^3
請問點計.幫幫忙

[ 本帖最後由 kin~仔於 2009-3-31 02:03 AM 編輯 ]

作者: h2oplusplus2 時間: 09-3-31 12:17 PM

你係唔係打錯問題
一係2M HCl, 個ANSWER會係6dm^3
一係就係8dm^3

但係好似20M ge HCl都好少有..

作者: ～狼～ 時間: 09-4-4 02:14 PM

原帖由 h2oplusplus2 於 2009-3-31 12:17 PM 發表
你係唔係打錯問題
一係2M HCl, 個ANSWER會係6dm^3
一係就係8dm^3

但係好似20M ge HCl都好少有..

唔係好少有,係直頭冇可能有,HCl最高濃度只係有12M而已

作者: 飯碗仔 時間: 09-4-4 08:37 PM

呢題好熟...如果我冇記錯..真係打錯...因為20M計唔到果個答案..

作者: Z31Allah 時間: 09-4-5 11:48 AM

Zn+2Hcl=>H2+ZnCl2
找limiting factor
mole ratio
then the mass

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