CHEMISTRY HELP! ASAP!?

How many molecules of aspirin contain 2.86 grams of hydrogen?

Explanation on how to do this?

Please and thanks.

1 Answer

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  • Anonymous
    8 years ago
    Favorite Answer

    You need the chemical formula of Aspirin.

    C9H8O4

    Now you need the molar mass. http://www.ptable.com/

    C9H8O4 = 180.1 g/mol

    H = 1g/mol

    You have 8H in the molecule, so now it's division.

    8/180.1 = 0.0444 x 100 = 4.44% of aspirin is H (this is mass%)

    2.86g H (1mol ASA/8g H)(6.022e23 molecules/1mol) = molecules ASA, because everything else cancels.

    math: 2.86*6.022e23/8 = 2.153e23 molecules ASA

    Hope this helps! :)

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