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:
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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