Hydrates Transitional Reasoning Practice

Chemistry · The Mole & Stoichiometry · Chemistry · The Mole

1 Chemistry practice questions on Hydrates. Questions that build towards applied reasoning.

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Questions

  1. 1.

    A student investigates an unknown hydrated metal chloride having the general formula MCl2⋅2H2O\text{MCl}_2 \cdot 2\text{H}_2\text{O}. A 4.88 g sample of this hydrate is heated strongly in a crucible until all the water of crystallization is driven off, leaving a residue of 4.16 g of anhydrous salt. Assuming the compound decomposes completely without side reactions, what is the identity of metal M? (Molar masses: H=1.0 g/mol\text{H} = 1.0\text{ g/mol}, O=16.0 g/mol\text{O} = 16.0\text{ g/mol}, Cl=35.5 g/mol\text{Cl} = 35.5\text{ g/mol})

    • A) Calcium (Ca)
    • B) Strontium (Sr)
    • C) Barium (Ba)
    • D) Copper (Cu)

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