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homework_4 - Grodin Micah Homework 4 Due 11:00 pm Inst Sara...

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Grodin, Micah – Homework 4 – Due: Feb 21 2006, 11:00 pm – Inst: Sara Sutcliffe 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Balance the equation ? HCl + ? Ca(OH) 2 ? CaCl 2 + ? H 2 O , using the smallest possible integers. The sum of the coefficients is 1. 5. 2. 7. 3. 6. 4. 4. 002 (part 1 of 1) 10 points Sulfur dioxide (SO 2 ) is an unwelcome result of burning soft coal in power plants. Some of the SO 2 ends up as sulfuric acid in acid precipitation. The net reaction is 2 SO 2 (g) + O 2 (g) + 2 H 2 O( ) -→ 2 H 2 SO 4 ( ) What mass in grams of SO 2 is needed to react with 1950 g of O 2 ? Answer in units of g. 003 (part 1 of 1) 10 points Nitrogen dioxide (NO 2 ) is a serious air pol- lutant that is formed when fuels are burned in air. Some of the NO 2 reacts with water in the air as shown below to form nitric acid (HNO 3 ), a major contributor to acid rain. Suppose that 4 . 2 tons of NO 2 are released into the atmosphere, and that 100% of this NO 2 reacts as shown.
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