A 5.00g sample of a carbohydrate (compound containing carbon, hydrogen, and oxygen) is found to contain 2.006g carbon, 0.334g hydrogen, and 2.66g oxygen. What is the percent by mass of oxygen in the carbohydrate

percentage mass of oxygen = 53.2%

Explanation:

A sample of carbohydrate is 5.00 g . The carbohydrate contains carbon, hydrogen and oxygen . The

mass of carbon  = 2.006 g  

mass of   hydrogen = 0.334 g

mass of oxygen = 2.66 g

The total mass of the sample is 5.00 g which is the sum of the mass of the whole elements present in the compound.

percentage mass of oxygen = 2.66/5.00 × 100

percentage mass of oxygen = 266 /5

percentage mass of oxygen = 53.2

percentage mass of oxygen = 53.2%