26-04-2016
Chemistry

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The mass percent of oxygen in CaO is (8 pts)

A28.5%

The mass percent of oxygen in CaO is (8 pts) a) 28.5 class=

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miss2and22 miss2and22

26-04-2016

what is the rest of the choices but I do think it is a

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ghaniraza14 ghaniraza14

26-04-2016

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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