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A patient takes 1gm of Calcium Carbonate salt three times a day. How much elemental calcium, in grams, is he getting in 24hrs? (MW of Ca: 40.078 g/mol, MW of CaCO3: 100.087 g/mol)
Correct Answer: C
Calcium makes up 40% of the MW of CaCO3. MW Ca / MW CaCO3 40.078 / 100.087 × 100% = 40%. 40% of 1 g CaCO3 = 0.4 g. Patient is taking 0.4 g of Ca 3 times daily. 0.4 g Ca × 3 = 1.2 g of Elemental Ca.