Law of Definite Proportions — Prelims Questions
A sample of pure carbon dioxide () contains 27.27% carbon and 72.73% oxygen by mass. If 100 grams of carbon are completely burned in excess oxygen to form carbon dioxide, what mass of oxygen will be consumed?
Which of the following statements is consistent with the Law of Definite Proportions?
Two samples of copper oxide were prepared. The first sample was obtained by heating copper metal in air, and it was found to contain 80% copper and 20% oxygen by mass. The second sample was obtained by reducing copper carbonate, and it was found to contain 80% copper and 20% oxygen by mass. This observation illustrates which law of chemical combination?
A 12.0 g sample of a compound containing only carbon and hydrogen was analyzed and found to contain 9.0 g of carbon. What is the percentage by mass of hydrogen in this compound?
Iron forms two oxides, A and B. In oxide A, 2.8 g of iron combines with 1.2 g of oxygen. In oxide B, 1.4 g of iron combines with 0.6 g of oxygen. Which law of chemical combination is illustrated by this data?
Which of the following substances would NOT strictly follow the Law of Definite Proportions?