The shell of eggs consists mainly of calcium carbonate CaCO3.

| July 6, 2021 | education

The shell of eggs consists mainly of calcium carbonate CaCO3. Calculate how much calcium a chicken loses with each egg laying if the shell mass is on average 10 g.

Given:
ω (CaCO3) = 90%
m (shells) = 10 g

To find:
m (Ca) -?

Decision:
1) Calculate the mass of CaCO3:
m (CaCO3) = ω (CaCO3) * m (shells) / 100% = 90% * 10/100% = 9 g;
2) Calculate the molar mass of CaCO3:
M (CaCO3) = Mr (CaCO3) = Ar (Ca) * N (Ca) + Ar (C) * N (C) + Ar (O) * N (O) = 40 * 1 + 12 * 1 + 16 * 3 = 100 g / mol;
3) Calculate the amount of CaCO3 substance:
n (CaCO3) = m (CaCO3) / M (CaCO3) = 9/100 = 0.09 mol;
4) Determine the amount of Ca substance:
n (Ca) = n (CaCO3) = 0.09 mol;
5) Calculate the mass of Ca:
m (Ca) = n (Ca) * M (Ca) = 0.09 * 40 = 3.6 g.

Answer: Ca mass is 3.6 g.



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