Why can't you separate carbon dioxide and get oxygen?

because there would have to be oxygen in the carbon dioxide to get the oxygen and carbon dioxide and oxygen put together make water because water is H2O
(2 hydrogen and 1 oxygen)

this answer is incorrect because there is oxygen in carbon dioxide or co2 ( one carbon two oxygen)
The top answer is completely incorrect, there is oxygen in carbon (C) dioxide (O2). It is possible to separate the carbon from the oxygen, but it is very difficult. This is because it is a stable atom, meaning the last electron shell is full. It is possible to separate it, but not on a large scale.