Question

The recommended daily allowance (RDA) of calcium is 1.2 g. Calcium carbonate contains 12.0% calcium by mass. How many grams of calcium carbonate are needed to provide the RDA of calcium?0.10 g0.14 g1.2 g14 g1.0 x 101 g

Answer 1

Answer:
`1.0* 10^1` grams of calcium carbonate are needed to provide the RDA of calcium.

Explanation:

Given,

The recommended daily allowance (RDA) of calcium is = 1.2 g

Calcium present in calcium carbonate = 12.0 % by mass i.e. 12 g of calcium is present in 100 g of calcium carbonate

Thus if 12 g of calcium is provided by 100 g of calcium carbonate.

1.2 g of of calcium is provided by =
`(100)/(12)* 1.2=10 g` of calcium carbonate.

Thus correct option is
`1.0* 10^1` g