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Molecular Weight

Percentage of...

Question

Percentage of calcium in calcium carbonate is ________.

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Solution

Step 1:Molecular mass of calcium carbonate (CaCO₃) = 40 + 12 + 16 ✕ 3 = 100 u
Step 2: Atomic mass of calcium = 40 u
Mass of calcium in 1 mole of CaCO₃= 40 grams
Step 3:Mass percentage of an element = mass of an element/mass of compound ✕ 100
Percentage of calcium = 40/100 ✕ 100 = 40%
Final Answer:
The percentage of calcium in calcium carbonate is 40%.

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