The daily RNI of calcium for adolescent females is 700 to 1100 mg. A supplement tablet contains 950 mg of calcium citrate. Each grams of calcium citrate contains 5.26 x 10^-3 mol calcium. How many tablets would a 16 year old female have to take to meet her daily RNI?
(i found the molar mass of calcium citrate multiplied it by the number of moles and then divided it to 0.95 but its wrong)
i got the answer as four tablets.Is it correct?
Each tablet contains 5.26E-3 mol Ca.
How many g Ca? That's 5.26E-3 mols x atomic mass Ca = approx 0.2 g (but you need to do that more accurately) or 200 mg. Then 200 mg/tablet x # tablets = 700 for the minimum. Solve for # tablets and if you get a fraction round to the larger whole tablet.
To determine how many tablets a 16-year-old female would need to take to meet her daily RNI of calcium, we can follow these steps:
Step 1: Calculate the number of moles of calcium needed
- To calculate the number of moles of calcium needed, we can use the lower end of the daily RNI range provided, which is 700 mg.
- Convert 700 mg to grams by dividing by 1000: 700 mg / 1000 = 0.7 g.
- Since each gram of calcium citrate contains 5.26 x 10^-3 mol of calcium, multiply 0.7 g by 5.26 x 10^-3 mol/g to get the number of moles of calcium needed.
Step 2: Calculate the number of tablets needed
- Each tablet contains 950 mg of calcium citrate, which we can convert to grams: 950 mg / 1000 = 0.95 g.
- Divide the number of moles of calcium needed (from step 1) by the number of moles of calcium in 0.95 g of calcium citrate.
The result of this calculation will give you the number of tablets needed to meet the daily RNI.