Ascientist finds one carbon atom for every two oxygen atoms in a sample of compound x. for which other samples of compound x should this ratio hold true?

The formula or chemical formula of a compound is same irrespective of source / mode of synthesis . Thus if a sample of compound has one carbon atom for every two atoms of oxygen (CO2), the formula will remains the same

So the answer is that for all other samples the compound X should hold this ration true.

all samples

Explanation:

A compound consists of two or more elements that are chemically combined in specific proportions. Every sample of compound X, no matter how large or small, will have one carbon atom for every two oxygen atoms.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.