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To find the number of moles in 12.0 g of calcium hydroxide, Ca(OH)₂, you first need to calculate its molar mass. The molar mass of Ca(OH)₂ is approximately 74.09 g/mol (calcium: 40.08 g/mol, oxygen: 16.00 g/mol, hydrogen: 1.01 g/mol). Using the formula ( \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} ), you can calculate the moles: ( \frac{12.0 , \text{g}}{74.09 , \text{g/mol}} \approx 0.162 , \text{moles} ). Thus, there are approximately 0.162 moles of Ca(OH)₂ in 12.0 g.

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