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11 June, 14:02

Find the molar mass of vitamin A (C20H30O).

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  1. 11 June, 15:18
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    Just add up the molar masses of each element.

    Molar mass of C: 12.011 g/mol

    The equation says C20, which means there are 20 carbon atoms in each molecule of Vitamin A. So, we multiply 12.011 by 20 to get 240.22 g/mol carbon.

    Molar mass of H: 1.0079 g/mol

    The equation says C30, which means there are 30 hydrogen atoms in each molecule of Vitamin A. So, we multiply 1.0079 by 30 to get 30.237 g/mol hydrogen.

    Molar mass of O: 15.999 g/mol

    The equation says O without a number, which means there is only one oxygen atom in each molecule of Vitamin A. So, we leave O at 15.999 g/mol.

    Then, just add it up:

    240.22 g/mol C + 30.237 g/mol H + 15.999 g/mol O = 286.456 g/mol C20H30O

    So, the molar mass of Vitamin A, C20H30O, is approximately 286.5 g/mol.
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