General Chemistry: Media Enhanced Edition, 8th Edition

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Names: ________ KEY ________________ CHEM 130: Disc. 215 GSI: Lauren Goodrich ____________________________ QUIZ 5 ____________________________ Show all work and report answers to the correct number of significant figures. 1. Fill in the blanks. (2 points) The ideal gas law fails at __ high ___ pressures and ___ low ___ temperatures. 2. List the two conditions for STP below. (2 points) a. 273.15K b. 1 atm 3. An aqueous solution of ammonium nitrite, NH 4 NO 2 , decomposes when heated to give off nitrogen, N 2 . This reaction may be used to prepare pure nitrogen. How many grams of ammonium nitrite must have reacted if 2.93 L of nitrogen gas was collected over water at
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Unformatted text preview: 19°C and 105kPa? The vapor pressure of water at 19°C is 16.5 mmHg. (5 points) NH 4 NO 2 (s) 2H 2 O(g) + N 2 (g) 8.00g NH 4 NO 2 4. Formic acid, CHCO 2 , when heated, forms carbon monoxide gas and water vapor. If a sample of formic acid produces 42L of gas, what is the mass of formic acid that was heated? Assume carbon monoxide and water act as ideal gases and the reaction takes place under STP. (5 points) If we use… CH 2 CO 2 (aq) 2CO(g) + H 2 O(g) 36g CH 2 CO 2 was heated Apparently I had a dyslexic moment… Formic acid really is HCHO 2 …then the equation would balance!...
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