Answer :
Final answer:
The molar mass of calcium hydroxide, Ca(OH)₂, is 74.16 g/mol (to three significant figures). Therefore, the correct answer is option C) 74.1 g.
Explanation:
The molar mass of calcium hydroxide, Ca(OH)₂, is calculated by adding the atomic masses of each element in the compound. Calcium has an atomic mass of 40.08 g/mol, oxygen has an atomic mass of 16.00 g/mol, and hydrogen has an atomic mass of 1.01 g/mol. Multiply the atomic mass of each element by the number of atoms present in the compound and add them all together. For calcium hydroxide, you have one calcium atom, two oxygen atoms, and two hydrogen atoms. The molar mass is:
Molar mass of Ca(OH)₂ = (1 x 40.08) + (2 x 16.00) + (2 x 1.01) = 74.16 g/mol (to three significant figures)
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