How many grams of oxygen are in 43.2 grams of calcium phosphate?

I got 17.79g. Because there are .139mol of the Ca3 (PO4)2 compound and then multiply that by the molar mass of O8 because of (PO4)2 makes eight oxygens. Anything wrong?

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  • Anonymous
    1 decade ago
    Favorite Answer

    Looks right to me, that is approximately what I got.

  • Anonymous
    4 years ago

    do no longer get fooled by using the formulation of CaPO4. look specifically on the question and undertaking your self with the question. what's the grams of Oxygen ? CaPO4 in basic terms takes place to have 4 atoms of Oxygen so multiply the burden of O by using 4 atoms 16g x 4 = sixty 4 g

  • 1 decade ago

    Look Atomic wt of oxygen is 16, Ca is 40 and P is 30.97

    Formula of calcium phosphate is Ca3(PO4)2

    Now do molecular mass=(40*3)+((30.97+(16*4))*2)

    =309.94 gm

    In which oxygen weigh= (16*4)*2=128 gm

    so, if 309.94 gm contain 128 gm oxygen, then 43.2 gm of calcium phosphate contain x gm of oxygen.

    309.94/128=43.2/x

    x=(43.2*128)/309.94=17.84 gm of oxygen

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