CHEM101 Graded Exam 2Topic 9: Energy Changes in Chemical Reactions FALL 2023 Straighterline

Potassium chlorate (used in fireworks, flares, and safety matches) forms oxygen and potassium chloride when heated. KClO3(s) → KCl(s) + O2(g) [unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely? Select one: A. 6.86 g B. 99.1 g C. 4.60 g D. 10.3 g E. 223 g My Account Question 2 Correct 5.00 points out of 5.00 Question 3 Correct 5.00 points out of 5.00 Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor as follows: 4NH3 + 5O2 → 4NO + 6H2O What is the maximum amount of water that may be produced if 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react? Select one: A. 1.56 mol B. 2.35 mol C. 3.52 mol D. 3.91 mol E. 1.88 mol Which could represent the reaction mixture after the complete combustion of acetaldehyde, CH3CHO? Select one: A. B. C. D. E. Question 4 Correct 5.00 points out of 5.00 Balance the following equation: C8H18O3(l) + O2(g) → H2O(g) + CO