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hw 3 chem

hw 3 chem - silva(jrs4378 Homework 3 Ideal gases...

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silva (jrs4378) – Homework 3: Ideal gases – Shear – (52375) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. You may need to look up conversion factors and values of R in the back of your textbook. 001 (part 1 of 3) 10.0 points Methanol (CH 3 OH) is the simplest of the al- cohols. It is synthesized by the reaction of hydrogen and carbon monoxide: CO(g) + 2 H 2 (g) -→ CH 3 OH If 544 mol of CO and 250 mol of H 2 are present, which is the limiting reactant? 1. H 2 correct 2. CO Explanation: n CO = 544 mol n H 2 = 250 mol limiting reactant = ? mole ratio : 2 mol H 2 1 mol CO . n H 2 required = 544 mol CO × 2 mol H 2 1 mol CO = 1088 mol H 2 Because there is only 250 mol H 2 available, the limiting reactant is H 2 . 002 (part 2 of 3) 10.0 points How much of the excess reactant remains un- changed? Correct answer: 419 mol. Explanation: remaining excess reactant = ? n COreacting = 1 mol CO 2 mol H 2 × 250 mol H 2 = 125 mol CO n excessreactant = 544 mol CO - 125 mol CO = 419 mol CO 003 (part 3 of 3) 10.0 points How much CH 3 OH is formed? Correct answer: 125 mol. Explanation: n limitingreactant = 250 mol H 2 amounts of CH 3 OH = ? mole ratio : 1 mol CH 3 OH 2 mol H 2 n CH 3 OH = 1 mol CH 3 OH 2 mol H 2 × 250 mol H 2 = 125 mol CH 3 OH 004 10.0 points Helium is used to inflate football-shaped bal- loons that will be released in Memorial sta- dium for the opening game of the football season. One 2.00 liter balloon pressurized

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