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Chem 105 at HCC worksheet and answer key. Exercise problems and solutions for introductory chemistry course.
Typology: Exercises
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CHEM 1405 Practice Comprehensive Final Exam and Answer Keys. Corwin ’s Introductory Chemistry
PART I – Multiple choice (3 points each). Do NOT mark on the test. Write your name and answers in Scantron.
Answer q = 10.0x1.00x(90-20) = 700 joules
2 C 4 H 10 (g) + 13 O 2 (g) → 8 CO 2 (g) + 10 H 2 O (g)
how many moles of water will be formed?
Answer: 10 moles C 4 H 10 (g) x 10 moles H 2 O (g) 2 moles C 4 H 10 (g) = 10x 2 = 50 moles H 2 O (g)
Answer: Mole C : mole H: mole O = 54.5/12 : 9.15/1.008 : 36.3/16 = 4.54 : 9.15 : 2.27 = 4.54/2.27 : 9.15/2.27 : 2.27/2.27 = 2 : 4 : 1 Thus, the empirical formula is C 2 H 4 O.