Chemistry 338 2 Semester Final Exam Review Sheet
Chemistry 338 2 Semester Final Exam Review Sheet
Chemistry 338 2 Semester Final Exam Review Sheet
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9. How many molecules are in 36 g of Li 2 O<br />
x x = 7.27x10 23 molecules Li 2 O<br />
Unit 5 – Stoichiometry – Chapter 9<br />
10. Using the following balanced equation: 4 NH 3 + 5 O 2 4 NO + 6 H 2 O<br />
a. If 10 moles of H 2 O get produced, how many moles of NO will also be produced?<br />
x<br />
b. How many grams of O 2 are needed to react 824 g of NH 3 ?<br />
x x<br />
Unit 6 – Gases – Chapter 11<br />
11. The pressure of a gas is 843 mm Hg at 24 o C. What will the pressure be at 100 o C?<br />
Volume is held constant.<br />
P 1 = 843 mm Hg<br />
T 1 = 297 K (24 o C + 273)<br />
P 2 = ?<br />
T 2 = 373 K (100 o C + 273)<br />
P 2 = 1058.7 mm Hg<br />
12. The volume of a gas is 81.7 mL when the pressure is 119 kPa. What is the volume when<br />
the pressure is changed to 500 kPa?<br />
P 1 = 119 kPa<br />
V 1 = 81.7 mL<br />
P 2 = 500 kPa<br />
V 2 = ?<br />
P 1 V 1 = P 2 V 2 (119 kPa)(81.7 mL) = (500 kPa)(V 2 ) V 2 = 19.4 mL<br />
Unit 7 - Solutions – Chapters 12-13<br />
13. What precipitate forms when you combine CaCl 2 and Na 2 CO 3 ?<br />
CaCl 2 + Na 2 CO 3 CaCO 3 (s) + 2 NaCl (aq)<br />
CaCO 3 (s)<br />
14. A solution is made by dissolving 30 g of NaCl into water creating a solution with a total<br />
volume of 2 L. What is the molarity?<br />
30gNaCl<br />
1moleNaCl<br />
x 0.513molNaC<br />
l<br />
1 58.5gNaCl
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