2.4g of magnesium are dissolved in excess dilute hydrochloric acid. After
crystallization, the mass of hydrated magnesium chloride (MgCl2 . 6H2O) is
A. 16.2g
B. 20.3g
C. 24.0g
D. 24.3g
Urgent about reacting mass !!! (Chem)
2008-10-27 3:50 am
回答 (1)
2008-10-27 7:46 am
✔ 最佳答案
The answer is B.
Molar mass of Mg = 24 g mol-1
Molar mass of MgCl26H2O = 24 + 35.5x2 + 6(1x2 + 16) = 203 g mol-1
Mg → → MgCl26H2O
Mole ratio Mg : MgCl26H2O
No. of moles of Mg used = 2.4/24 = 0.1 mol
No. of moles of MgCl26H2O formed = 0.1 mol
Mass of MgCl26H2O formed = 0.1 x 203 = 20.3 g
=
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