Hello, Raneem,
Please check my response to a similar question you posted to get the details on how this can be answered.
Bob

J.R. S.
tutor
What don't you get. The total mass = 50 g. Ca is 20 g, so % Ca = 20/50 x100% = 40%. Carbon (C) is 6 g so % C = 6/50 x100% = 12% and oxygen (O) is 24 g so %O = 24/50 x 100% = 48%. Now do you get it?
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01/11/21
Raneem M.
i don't get it01/11/21