A patient takes 1 g of calcium carbonate salt three times daily. How much elemental calcium is provided in 24 hours?

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Multiple Choice

A patient takes 1 g of calcium carbonate salt three times daily. How much elemental calcium is provided in 24 hours?

Explanation:
Elemental calcium content comes from the weight fraction of calcium in calcium carbonate. Calcium carbonate has a formula weight of about 100 g/mol with calcium weighing about 40 g, so elemental calcium is 40% of the salt by weight. Therefore, each gram of CaCO3 provides about 0.4 g of elemental calcium. Taking 1 g of CaCO3 three times daily gives 3 g CaCO3 per day. 3 g × 0.4 = 1.2 g of elemental calcium in 24 hours. So the correct daily amount is 1.2 g. The 0.8 g figure would require only 2 g of CaCO3 per day, which does not match the given dosing.

Elemental calcium content comes from the weight fraction of calcium in calcium carbonate. Calcium carbonate has a formula weight of about 100 g/mol with calcium weighing about 40 g, so elemental calcium is 40% of the salt by weight. Therefore, each gram of CaCO3 provides about 0.4 g of elemental calcium.

Taking 1 g of CaCO3 three times daily gives 3 g CaCO3 per day. 3 g × 0.4 = 1.2 g of elemental calcium in 24 hours. So the correct daily amount is 1.2 g. The 0.8 g figure would require only 2 g of CaCO3 per day, which does not match the given dosing.

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