Complete the following sentence using the most appropriate words. In a suspected case of carbon monoxide poisoning, a layer of (sodium fluoride, liquid paraffin, potassium oxalate) is added to prevent reaction with (oxygen, nitrogen, carbon dioxide) in the air.

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Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.