Problems please show all your work and round off to

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****************************************************************************** Problems: Please show all your work, and round off to the appropriate number of significant figures where needed. 1. An empty graduated cylinder has a mass of 42.817 g. When filled with 50.0 mL of an unknown liquid, it has a mass of 106.773 g. What is the density of the liquid?
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CHEM30A EXAM #1A FALL 2008 5 2. An extra strength aspirin tablet contains 0.500 g of the active ingredient, acetylsalicylic acid. Aspirin strength is usually measured in grains. If 1 grain = 60 mg, how many grains of the active ingredient are in 1 tablet? (Report your answer in 3 significant figures.) 3. Write the formula for the compound, glucose, given the following composition: 6 atoms carbon + 12 atoms hydrogen + 6 atoms oxygen 4. Answer the following questions for the formula Al 2 (SO 4 ) 3 : a) Give the names of all the elements in this formula. b) How many atoms of oxygen are represented in this formula? c) How many total atoms are present?
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CHEM30A EXAM #1A FALL 2008 6 5. Perform the following calculation: 213 miles = ? 4.20 hours ****************************************************************************** Extra Credit (3 pts): Name three elements, all metals, in the first four rows of the periodic table, beginning with the letter C. a) ________________ b) ________________ c) ________________ ****************************************************************************** Helpful Info: 2.54 cm = 1 inch ° F = 1.8 ( ° C) + 32 K = ° C + 273.15 ****************************************************************************** EXAM TOTAL + EXTRA CREDIT = SCORE ___________ + ____________ = /125
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