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mixter17
Hello!

0,773 moles of Ca(OH)₂ contain 4,653 · 10²³ molecules.

To calculate that we need to use the Avogrado Number. This number tells us the number of molecules that are in 1 mol of a substance. The name "Avogrado Number" was given in honor of Amadeo Avogadro, an Italian scientist who studied atomic theory. The number is 6,02· 10²³ molecules/mol. To calculate the number of Ca(OH)₂ molecules we use the following conversion factor:

[tex]nmolecules=0,773 moles Ca(OH)_2* \frac{6,02* 10^{23} molecules Ca(OH)_2 }{1 mol Ca(OH)_2} \\ \\ =4,653 * 10^{23} molecules Ca(OH)_2[/tex]

Have a nice day!
From the Avogadro's  constant 1 mole of a substance contains 6.022 ×10^23 particles.
Therefore; 1 mole of Ca(OH)2  contains 6.022×10^23 molecules
Thus; 0.773 moles contains; 
    0.773 × 6.022 ×10^23 molecules 
 = 4.655 ×10^23 molecules

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