How many grams of calcium are in 5.00 g of calcium hydroxide?

Question

Quizplus · Accepted Answer

Calcium hydroxide has a molar mass of 74.10 g/mol, with one calcium atom per molecule. Thus, the mass percent of calcium in calcium hydroxide is (40.08 g/mol)/(74.10 g/mol) x 100% = 54.11%. Therefore, 5.00 g of calcium hydroxide contains (5.00 g) x (54.11/100) = 2.71 g or 2710 mg of calcium. Rounded to two significant figures, the answer is 2.7 g, which corresponds to choice C.

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