What reactant is left over and how much of it is left over? (5 points) O2 = .503-.443=.06 moles (Reference: Chang 3.83) 8. Propane (C 3 H 8 ) is a component of natural gas and is used in domestic cooking and heating. It burns according to the following reaction: C 3 H 8 + O 2 → CO 2 + H 2 O a. Balance the equation representing the combustion of propane in air. (5 points) i. C 3 H 8 + 5O 2 → 3CO 2 + 4H 2 O b. How many grams of carbon dioxide can be produced by burning 20.0 pounds of propane, the typical size of a BBG grill propane tank? Assume that oxygen is the excess reagent in this reaction. (5 points) i. 20 lbs of propare = 20/2.2= 9.090 Kg= 9.090*1000= 9090 grams ii. Moles= 9090/44= 206 moles of C3H8 3 Copyright © 2017 by Thomas Edison State University . All rights reserved.
iii. 1 mole of C3H8 to 3 Moles of 3CO2 = 618 moles of CO2 iv. Mass = (618/1)(44/1)= 27,192 grams 9. Hydrogen fluoride is used in the manufacture of Freons (which destroy ozone in the stratosphere) and in the production of aluminum metal. It is prepared by the reaction CaF 2 + H 2 SO 4 → CaSO 4 + 2HF In one process 6.00 kg of CaF 2 are treated with an excess of H 2 SO 4 and yield 2.86 kg of HF. Calculate the percent yield of HF. (5 points) 6g= 6000kg 6000/1*1/59.08*2/1*19/1=3859grams % yield=2860/3859*100=74% (Reference: Chang 3.89) 10. Certain race cars use methanol (CH 3 OH; also called wood alcohol) as a fuel. Methanol has a molecular mass of 32.0 g/mol and a density of 0.79 g/mL. The combustion of methanol occurs according to the following equation: 2CH 3 OH + 3O 2 → 2CO 2 + 4H 2 O In a particular reaction 2.00 L of methanol are reacted with 80.0 kg of oxygen.
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