Question

28. How much calcium is present in 0.1g of CaCO3?
a. 0.01g
b. 0.02g
C. 0.03g
d. 0.04g

Answer 1

Answer:

Start with the equation:

Ca + CO3 → CaCO3

As you can see the ratio is 1:1:1. Then enter their atomic masses, to calculate the ratio between the masses. After which they can be used to calcuate the weight you want to know.

Atomic masses:

40,08 Ca + 60,01 CO3 → 100,09 CaCO3

Weight Ratio:

4 Ca + 6 CO3 → 10 CaCO3

So:

0.1 gram / 10 x 4 = 0,04 gram Calcium

Option D

Explanation:

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Answer 2

Explanation:

How much calcium is present in 0.1g of CaCO3?

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Start with the equation:

Ca + CO3 → CaCO3

As you can see the ratio is 1:1:1. Then enter their atomic masses, to calculate the ratio between the masses. After which they can be used to calcuate the weight you want to know.

Atomic masses:

40,08 Ca + 60,01 CO3 → 100,09 CaCO3

Weight Ratio:

4 Ca + 6 CO3 → 10 CaCO3

So:

0.1 gram / 10 x 4 = 0,04 gram Calcium