Stoichiometry Review Stoichiometry Review Grade: Subject: Date: 1 How many moles are in 22.0 g of carbon dioxide? A B C D E What is the mass of one atom of copper in grams? A B C D E 4 63.5 g 52.0 g 58.0 g 65.4 g 1.06 x 1022 g How many atoms of hydrogen are present in 6.0 g of water? A B C D E 5 0.50 mol 2.0 mol 0.5 mol 2.00 mol 0.500 mol Naturally occurring element X exists in three isotopic forms: X28 (27.977 amu @ 92.21 % abundance), X29 (28.976 amu @ 4.70% abundance), and X30 (29.974 amu @ 3.09% abundance). Calculate the atomic weight of X. 2 3 «grade» AP Chemistry «date» 2.0 x 1023 7.2 x 1024 1.1 x 1024 4.0 x 1023 0.66 Nitric acid contains what percent hydrogen by mass? A B C D E 20% 10.0% 4.50% 1.60% 3.45% 1 6 A hydrocarbon is found to be 85.6% carbon by mass. What is the empirical formula for this compound? A CH B CH2 C C3H D C6H E CH6 7 When 20.0 g of ethane and 64.0 g of oxygen gas react, how many grams of water are formed? A B C D E 8 15.4 g 18.0 g 58.0 g 20.0 g 6.70 g Given the equation 3A + B g C + D, you react 2 moles of A with 1 mole of B. Is the following true or false? A is the limiting reactant because you need 3 moles of A and have 2. True False 9 The molecular formula always represents the total number of atoms of each element present in a compound. True False 10 The reactant with the highest molar mass is always the limiting reactant. True False 2 11 A 20.0 g sample of HF is dissolved in water to give 2.0 x 10 mL of solution. the concentration of the solution is: 1.0 M A 3.0 M B 0.10 M C 5.0 M D 10.0 M E 2 12 What mass of solute is contained in 250 mL of a 0.800 M ammonium chloride solution? A B C D E 10.7 g 13.7 g 47.9 g 53.5 g 107 g 13 What volume of 18.0 M sulfuric acid must be used to prepare 15.5 L of 0.195M H2SO4? A B C D E 168 mL 0.336 L 92.3 mL 226 mL 21.9 mL 14 The empirical formula of styrene is CH; its molar mass is 104.1. What is the molecular formula of styrene? A B C D E C2H4 C8H8 C10H12 C6H6 C4H4 15 Consider the following reaction: 2A + B g 3C + D. 3.0 mol A and 2.0 mol B react to form 4.0 mol C. What is the percent yield of this reaction? A 50 % B 67% C 75% D 89% E 100% Answers: 1. E (3 sig figs) 2. 28.09 3. E 4. A 5. D 6. B 7. E 8. True 9. True 10. False 11. D 12. A 13. A 14. B 15. D 3
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