During the combustion of 5.00 g of butane in the presence of oxygen, 4.01 g of carbon dioxide and 3.55 g of water is given off. how much oxygen was needed to totally combust the butane?

iron combines with 4.00 g of copper (11) nitrate to form 6.01 g of iron (i) nitrate and 0.400 g copper metal. how much iron did it take to convert the cu(no3)2?

Which of the following statements best distinguishes a hypothesis from a theory? a. theories are hypotheses that have been proved. b. hypotheses are guesses; theories are correct answers c. hypotheses usually are relatively narrow in scope; theories have broad explanatory power. d. theories are proved to be true; hypotheses are often contradicted by experimental results.