CHEMISTRY QUESTION
2011-06-03 4:11 am
The formula of a metal carbonate is X2CO3. 50cm^3 of a solution containing 0.53g of the carbonate required 25.00cm^3 of 0.2M sulphuric acid for complete reaction. What is the relative atomic mass of metal X?
回答 (1)
2011-06-03 5:20 am
✔ 最佳答案
X2CO3 + H2SO4 ---> X2SO4 + CO2 + H2O (Since X+ is carried in X2CO3)No. of moles of sulphuric acid
= 0.2 * 25/1000
= 5*10^-3 mol
By mole ratio:
No. of moles of X2CO3 reacted
= 5*10^-3 mol
Let x be the relative atomic mass of metal X
2x + (12 + 16*3) = 0.53 / 5*10^-3
2x + 60 = 106
x = 23
Hence relative atomic mass of metal X is 23.
(Note that there is no unit for relative atomic mass)
2011-06-02 21:21:11 補充：
Next time put it into chemistry category....
參考: Knowledge is power.
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