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A 4.25g sample of a compound containing carbon,hydrogen,oxygen was burnt in an atmosphere of pure...

A 4.25g sample of a compound containing carbon,hydrogen,oxygen was burnt in an atmosphere of pure oxygen,this produced 9.34g Co2 and 5.09gH2O. Calculate a)mass of C and H that were in d original sample of 4.25g. b)what is d mass of O in d original sample. c)what is d percentage composition of dis compound. d)what is d empirical formula of d compound?
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