A 9.780-g gaseous mixture contains ethane (C2H6) and propane (C3H8). Complete combustion to form carbon dioxide and water requires 1.120 mol oxygen. Calculate the mass percent of ethane in the original mixture.
Week 3 Notes Chemistry Matter at the Atomic Level Laws and Atomic Models Law of Conservation of Matter:matter can’t be created or transformed. Law of Multiple Proportions: When an element combines with a different element to form multiple compounds, the ratio of the masses of one element to a fixed amount of the second element is a ratio of small whole numbers. Law of Definite Proportions: The same compound will always be comprised of itsconstituent elements in the same proportion by mass. Thomson’s Model: o He created a spark (cathode ray) and discovered that this spark or beam was deflected by an electric field; this proved the existence of negatively charged particles: elec