Problem: The reaction between nickel metal and hydrochloric acid is not a simple dissolution. The product is NiCl2 6H2O(s), nickel(II) chloride hexahydrate, which has exactly 6 waters of hydration in the crystal lattice for every nickel ion.What is the molar mass of nickel chloride hexahydrate, NiCl2 6H2O(s)?

FREE Expert Solution

We’re asked to determine the molar mass of nickel chloride hexahydrate, NiCl2•6H2O(s).


Recall that the molar mass of a compound is the sum of the atomic mass of each element in the compound. 

**Multiply each atomic mass by its subscript


The subscript indicates the number of each element in the formula:

  • When an element has no subscript = 1
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Problem Details


Photographs show nickel metal (metallic spheres) and hydrochloric acid (clear liquid). Nickel reacts with hydrochloric acid, forming NiCl2 (aqueous, a green liquid with a solid at the bottom) and H2 (gas). The solution is of NiCl2, not Ni metal. NiCl2 dot 6 H2O (a green, lumpy solid) remains when the solvent is evaporated.


The reaction between nickel metal and hydrochloric acid is not a simple dissolution. The product is NiCl2 6H2O(s), nickel(II) chloride hexahydrate, which has exactly 6 waters of hydration in the crystal lattice for every nickel ion.


What is the molar mass of nickel chloride hexahydrate, NiCl2 6H2O(s)?

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