Study guide for Chem 1 exam

Study guide for Chem 1 exam - Practice problems 1 How many...

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Practice problems: 1. How many milligrams are in one gram? 2. Black coffee with sugar is a 3. Name a noble gas, alkaline earth metal, and a transitional metal 4. Mass of 1 molecule of cyanide ion 5. Mass of 2.20 moles ammonium nitrate 6. Describe the scientific method in three easy steps 7. How many moles of glucose are in 405 g sugar (C 6 H 12 O 6 ) 8. How many molecules of glucose present? 9. Problem # 51 from txt book: molar mass of Prozac (C 17 H 18 F n NO)
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10. If 60 mg is the max daily dosage for Prozac, what is the daily dosage in moles? And molecules? 11. Calculate the average atomic mass of chlorine (chart in notes): Isotopic abundance: 35CL: 37CL: 12. Carbon has an average mass of 12.011 amu with two main isotopes( 12 C and 13 C). What are the abundances of these isotopes? 13. What’s the empirical formula for C 6 H 6 and mass persentages of C, H? 14. A suspicious substance is found at a supermarket with the following mass percentage: 40.00% Carbon, 6.71% Hydrogen, 53.29% Oxygen. a. Determine the empirical formula for unknown substance. (hint: # moles of each element in 100.00g)
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b. If the mass of one molecule of the substance is ___________, what is the identity of the unknown substance? 15. Caffeine is made up of 49.48% Carbon, 5.15% Hydrogen, 28.87% Nitrogen, and 16.49% Oxygen by mass. Determine the Empirical formula and Molecular formula for caffeine. (MW= _______g/mol) 16. A compound is found to be a neurotoxin and a potent greenhouse gas. The compound is found to contain 31.42% sulfur, 31.35% oxygen, and 37.23% flourine by weight.
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