The daily RNI of calcium for adolescent females is 700 to 1100 mg. A supplement table contains 950mg of calcium citrate. Each gram of calcium citrate contains 5.26x10 to the power negative 10 mol calcium. How many tablets would a 16 year old female have to take to meet her daily RNI?
2007-05-30 03:11:12 · 2 answers · asked by John J 1 in Science & Mathematics ➔ Chemistry
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2007-05-30 05:24:02 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 0⤋
The question is wrong : calcium citrate is Ca3(C6H5O7)2
molar mass = 498.46 g/mol
1 g / 498.46 = 0.00201 mole
because there are 3 Ca each gram of calcium citrate contains 0.00201 x 3 = 0.00603 mole of Ca
950 mg = 0.950 g
1 g : 0.00603 mole = 0.950 : x
x = 0.00573 mole Ca
0.00573 x 40.08 g/mol = 0.229 g = 229 mg
if we want 700 mg of Ca we have to take 700/ 229 = 3 tablets
2007-05-30 12:32:00 · answer #2 · answered by Non più attiva su answers 7 · 0⤊ 0⤋