Transcript Document
Problem 1 Total • 4000 yellow legos • 2000 black legos • 1200 blue legos • 400 orange legos • Write analogous empirical and molecular formula • YwBkxBuyOz Hint 1: How did you decide on the lowest ratio of Boys to Girls in the people demo? Problem 1 Total • 4000 yellow legos • 2000 black legos • 1200 blue legos • 400 orange legos • If there were four butterflies, what is the “molecular formula”, aka how many of each colored lego was present in the butterfly. • YwBkxBuyOz Problem 2: • The compound sold under the name Prozac is 66.01% C, 5.87% H, 18.43% F, 4.53% N and 5.17% O. What is the empirical formula? Hint: Get numbers of each atom. Compare them (divide by the smallest) like we did in the example with your fellow students moving around. Problem 3: A folk medicine used in the Anhui province of China to treat acute dysentery is cha-tiao-qi, a preparation of the leaves of Acer ginnala. Reaction of one of the active ingredients in cha-tiao-qi with water yields gallic acid, a powerful antidysenteric agent. Gallic acid is known to contain carbon, hydrogen and oxygen. A chemist wanting to determine the molecular formula of gallic acid burned 1.000g of the compound in an elemental analyzer. The products of the combustion were 1.811 g of CO2 and 0.3172 g of H2O. a) Determine the empirical formula of the compound . b) The molar mass was found to be 170.12 g/mol. What is the molecular formula of gallic acid ? c) What would the formula be if the mass was found to be 510 g/mol ? Problem 3 A folk medicine used in the Anhui province of China to treat acute dysentery is cha-tiao-qi, a preparation of the leaves of Acer ginnala. Reaction of one of the active ingredients in cha-tiao-qi with water yields gallic acid, a powerful antidysenteric agent. Gallic acid is known to contain carbon, hydrogen and oxygen. A chemist wanting to determine the molecular formula of gallic acid burned 1.000g of the compound in an elemental analyzer. The products of the combustion were 1.811 g of CO2 and 0.3172 g of H2O. a) Determine the empirical formula of the compound . How many mols of C are present? How many mols of H are present? How many mols of O are present? What is the empirical formul? Problem 3 A folk medicine used in the Anhui province of China to treat acute dysentery is cha-tiao-qi, a preparation of the leaves of Acer ginnala. Reaction of one of the active ingredients in cha-tiao-qi with water yields gallic acid, a powerful antidysenteric agent. Gallic acid is known to contain carbon, hydrogen and oxygen. A chemist wanting to determine the molecular formula of gallic acid burned 1.000g of the compound in an elemental analyzer. The products of the combustion were 1.811 g of CO2 and 0.3172 g of H2O. b) The molar mass was found to be 170.12 g/mol. What is the molecular formula of gallic acid ? If the empirical formula is C7H6O5. What is the empirical mass? Problem 3 A folk medicine used in the Anhui province of China to treat acute dysentery is cha-tiao-qi, a preparation of the leaves of Acer ginnala. Reaction of one of the active ingredients in cha-tiao-qi with water yields gallic acid, a powerful antidysenteric agent. Gallic acid is known to contain carbon, hydrogen and oxygen. A chemist wanting to determine the molecular formula of gallic acid burned 1.000g of the compound in an elemental analyzer. The products of the combustion were 1.811 g of CO2 and 0.3172 g of H2O. c) What would the formula be if the mass was found to be 510 g/mol ?