Chemical Reactions
Chemical Reactions
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Chemical Reactions
Question 1. What is the molar mass of an oxygen molecule?
Answer: (B) 32.00 g/mol (Lew 38)
Question 2.Complete combustion of a hydrocarbon (a molecule containing only carbon and hydrogen) is a reaction where oxygen reacts with the compound to yield carbon dioxide and water. Which of the following is the correct, balanced equation for complete combustion of C2H4?
Answer: (B) C2H4 + 2O2 2H2O + 2CO2 (Lew 31)
Question 3. How many hydrogen atoms are in 14.8 g of (C2H5)2O?
Answer: (B) 1.20 X 1024
Question 4. What is the mass of 0.250 mol of Mg(OH)2?
Answer: (B) 14.6 g
Question 5. What is the molar mass of calcium hydroxide?
Answer: (D) 74.10 g/mol
Question 6. What is the coefficient for O2 after you balance the following equation:
___ C3H8 + ___ O2 ➔ ___ CO2 + ___ H2O
Answer: (C) 5
Question 7. If iron reacts with oxygen to form iron (II) oxide, which of the following equations correctly represents this process?
Answer: (D) 2Fe + O2 2FeO
Question 8. How many mol of Al2O3 are present in 86.5 g of Al2O3?
Answer: (C) 0.848 mol
Question 9. What is the mass of 1.26 mol of CF4?
Answer: (D) 111 g
Question 10. How many hydrogen atoms are in 2.8 mol of ammonia?
Answer: (B) 1.7 X 1024
Question 11. How many mol of Ca2+ ions are in 2.8 mol of Ca3N2?
Answer: (B) 8.4 mol Ca2+
Question 12. If potassium reacts with bromine to form potassium bromide, which of the following equations correctly represents this process?
Answer: (C) 2 K + Br2 2KBr (Lew 90)
Question 13. How many chloride ions are in 14 mol of CaCl2?
Answer: (A) 1.7 X 1025 Cl—
Question 14. What is the coefficient for chlorine after the following equation is balanced?
___ I2 + ___ Cl2 ➔ ___ ICl5
Answer: (D) 5
Question 15. Is the following equation balanced? Na3PO4 + AlCl3 3 NaCl + AlPO4
Answer: (B) No
Question 16. How many carbon atoms are present in 25.6 g of benzene (C6H6)?
Answer: (A) 1.18 X 1024 C atoms
Question 17. What is the mass of 67,500 molecules of O2?
Answer: (B) 3.59 X 10–18 g (Lew 33)
Question 18. How many moles of O atoms are there in 0.73 moles of Ca(ClO4)2?
Answer: (B) 5.8
Question 19. If magnesium reacts with hydrogen to form magnesium hydride, which of the following equations correctly represents this process?
Answer: (C)Mg + H2 MgH2
Question 20. If you have 5.0 X 1024 molecules of water, how many mol of water do you have?
Answer: (C) 1.5 X 102 mol H2O
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