CHEM121-EXAMI-SP09-practice

CHEM121-EXAMI-SP09-practice - Name _ Chemistry 121 EXAM I...

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Name ____________________ Chemistry 121 EXAM I Spring 2009 100 points 1. (24pts/6pts each) a. The distance from the Earth to the moon is approximately 240,000 miles. The peregrine falcon has been measured as traveling up to 350 km/hr in a dive. If this falcon could fly to the moon at this speed, how many seconds would it take? (Useful conversion: 1 mile = 1.609km) b. Which of the following has a greater mass: 2 atoms of lead (Pb) or 5.1 x 10 -23 moles of helium? c. Cyclopropane (Molar Mass equals 42 g/mol), a compound that contains only carbon and hydrogen, is used as an anesthetic. A 1.00g sample of this compound is completely burned in a combustion chamber, producing 3.14g of CO 2 and 1.29g of H 2 O. What is the molecular formula of this compound?
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d. The compound glucose-1-phosphate is of crucial importance in the metabolism of carbohydrates in humans. The density of glucose-1-phosphate is 1.5 g/cm 3 and its molar mass is 260 grams/mole. What is the volume in cm 3 of ONE MOLECULE of glucose-1-phosphate? 2. (10pts) Naturally occurring lithium is a mixture of lithium-6 (atomic mass- 6.01512amu) and lithium-7 (atomic mass =7.01600amu). What is the percent composition for each of these isotopes of lithium? (Hint: Use the Periodic Table for the total atomic mass of Li)
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(16pts) Magnesium metal and oxygen react to form magnesium oxide, which is a white solid. If 36.5g of Mg and 35.0g of O 2 actually produce in the lab 52.3 grams of magnesium oxide Balanced Equation (2pts): (8pts)What is the percent yield of Magnesium oxide as determined by the limiting reactant problem? (6pts)How many grams of the remaining reactant are left over after the reaction has run
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This note was uploaded on 06/04/2010 for the course CHEM 121 taught by Professor Heske during the Spring '08 term at University of Nevada, Las Vegas.

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CHEM121-EXAMI-SP09-practice - Name _ Chemistry 121 EXAM I...

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