Calculate the percentage by mass of calcium in calcium trioxocarbonate (IV) [Ca=40, C=12, O=16]

 Calculate the percentage by mass of calcium in calcium trioxocarbonate (IV) [Ca=40, C=12, O=16]

A. 20

B. 30

C. 40

D. 50

E. 60

Calculation:

Calcium trioxocarbonate (IV) is calcium carbonate, CaCO₃.

Step 1: Calculate the molar mass of CaCO₃

• Ca = 40

• C = 12

• O₃ = (3 *16 = 48)

Molar mass of CaCO₃ = 40 + 12 + 48 = 100

Step 2: Calculate percentage by mass of calcium

%Ca = {40}/{100} * 100 = 40%

✅ Correct Answer

C. 40

QUESTION NUMBER FIVE