Mass fraction of calcium in calcium carbonate is …
| January 31, 2021 | education
Given:
CaCO3
To find:
ω (Ca in CaCO3) -?
Decision:
1) Using the periodic system of D.I.Mendeleev, calculate the relative molecular weight of calcium carbonate:
Mr (CaCO3) = Ar (Ca) + Ar (C) + Ar (O) * 3 = 40 + 12 + 16 * 3 = 100;
2) Calculate the mass fraction of calcium in calcium carbonate:
ω (Ca in CaCO3) = N (Ca in CaCO3) * Ar (Ca) * 100% / Mr (CaCO3) = 1 * 40 * 100% / 100 = 40%.
Answer: Mass fraction of calcium in calcium carbonate is 40%
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