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9 April, 00:55

The mass percent of oxygen in CaO is what

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  1. 9 April, 03:56
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    Add the reltive atomic mass of Ca and O which are 40 and 16 respectively after addition we get molecular mass of CaO which is 40+16=56 now divide atomic mass of O by molecular mass of CaO and multiply it with 100 as show n 16/56 * 100=28.57%
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