20A Final Review Problems

20A Final Review Problems - Final Exam Review Aid Chem 20A...

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Final Exam Review Aid Chem 20A – Prof. Eric Scerri 1. How many moles are there in each of the following? a. 128 g of CO 2 b. 10 molecules of SO 2 c. 0.032 g of O 2 2. A compound consisting of only carbon and chlorine shows an analysis of 10.15% carbon and 89.95% chlorine. If each molecule weighs 3.93 x 10 22 g, what is the molecular formula of the compound? 3. Vitamin C is an organic compound containing the three elements carbon, hydrogen, and oxygen. When 2.00 mg of Vitamin C is burned 3.00 mg of CO 2 is formed and 0.816 mg of water. What is the empirical formula of Vitamin C? 4. The work function for a silver surface is 7.57 x 10 -19 J. Find the minimum frequency that light must have to eject electrons from this surface. 5. Determine the de Broglie wavelength for a. An electron moving at a speed of 6.0 x 10 6 m/s b. A baseball with mass 150 g moving at a speed of 13 m/s 6. Assume that the position of an object is known so precisely that the uncertainty in the position is only y = 1.5 x 10
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20A Final Review Problems - Final Exam Review Aid Chem 20A...

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