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Find unknown element

[From: ] [author: ] [Date: 11-11-08] [Hit: ]
the moles of chloride = moles of the metal chloride MCl.So,20.0 g / 0.268 mol = 74.The molar mass of the metal = 74.......
20.0g of an unknown metal chloride MCl is dissolved in 100 mL of water. If 357 mL of 0.750 M AgNO3 are required to precipitate (as AgCl) all the chloride in the solution, what is the identity of element M?

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Moles of Ag+ = moles of Cl- = 0.357 L X 0.750 mol/L = 0.268 moles Cl-.

Since the compound has the formula MCl, the moles of chloride = moles of the metal chloride MCl.

So, the molar mass of the metal chloride is:
20.0 g / 0.268 mol = 74.7 g/mol

The molar mass of the metal = 74.7 - 35.4 = 39.3 g/mol

The only metal close is K, potassium.
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