M(Ca(OH)2)=240 g m (CaO)-?

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вопрос

To find the molar mass of CaO from Ca(OH)2, we first need to calculate the molar mass of Ca(OH)2 and then find the molar mass of CaO.

Molar mass of Ca(OH)2:
Calcium (Ca) has a molar mass of 40.08 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Hydrogen (H) has a molar mass of 1.01 g/mol.

Ca(OH)2 is composed of one calcium atom, two hydrogen atoms, and two oxygen atoms:
Mass of Ca = 1 x 40.08 = 40.08 g/mol
Mass of O = 2 x 16.00 = 32.00 g/mol
Mass of H = 2 x 1.01 = 2.02 g/mol

Molar mass of Ca(OH)2 = 40.08 + 32.00 + 2.02 = 74.10 g/mol

Now, to find the molar mass of CaO, we need to subtract water (H2O) from Ca(OH)2:
Molar mass of H2O = 2(1.01) + 16.00 = 18.02 g/mol
Molar mass of CaO = Molar mass of Ca(OH)2 - Molar mass of H2O
Molar mass of CaO = 74.10 g/mol - 18.02 g/mol
Molar mass of CaO = 56.08 g/mol

Therefore, the molar mass of CaO is 56.08 g/mol.