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122_recwk1wi06_KEYstd - 1 a Write a balanced chemical...

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KEY Name________________________________________________ Recitation-TA__________________________ Group Member Names__________________________________________________________________________ 1 Chapter 10 Chemistry 122 (Allen) Recitation - Week 1 Recitation Directions 1. First 15-20 minutes a. Assemble in groups of 3 or 4; Spend 5 minutes working this problem out - on your own; then compare answers and ways of working out the problem with your group; agree on the best way to work out the problem with your group b. One group member will present their group’s results on the board from one group (TA to assign group/member; if no group has the correct answer(s), the TA will present) 2. remainder of time a. Your TA will answer homework, lecture, or lab questions as time permits b. If no specific questions are asked, your TA will go over pre-selected non-homework problems
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Unformatted text preview: 1. a) Write a balanced chemical equation for the complete reaction of gaseous nitrogen and gaseous hydrogen to produce the only product, gaseous ammonia. N 2 (g) + 3 H 2 (g) = 2 NH 3 (g) (It is important for the students to recognize which atoms form diatomic molecules, and the difference between ammonia (NH 3 ) and ammonium (NH 4 + ).) b) At constant pressure and temperature, 2.4 L of nitrogen reacts with 7.2 L of hydrogen. If all the nitrogen and hydrogen are consumed, what volume of ammonia, at the same temperature and pressure, will be produced? Avogadro’s hypothesis… Mole ratios in the chemical equation will be the volume ratios for the gases if they are at the same temp. and pressure. Therefore, there are 2 ways to answer this problem: 2.4 L N 2 (2 mole NH 3 /1 mol N 2 ) = 4.8 L NH 3 OR 7.2 L H 2 (2 mol NH 3 /3 mol H 2 ) = 4.8 L NH 3...
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