Chemistry Multiple Choices Assignment
Chem 101: Introduction to General Chemistry Quiz #7 100 points possible Due before noon on
Wednesday, Oct. 22, 2014 Submit answers on moodle. Each question is worth five points. 1. Given the
following balanced chemical equation, how many mol of oxygen are required for the complete reaction
of 2.4 mol of C2H4? C2H4 + 3 O2 ➔ 2 CO2 + 2 H2O A. 0.80 B. 2.4 C. 7.2 D. 3.0 2. Given the following
reaction, if 14.9 g of Cl2 reacts completely with excess P, how many g of PCl3 will be produced? 2 P + 3
Cl2 ➔ 2 PCl3 A. 19.2 g PCl3 B. 25.6 g PCl3 C. 9.93 g PCl3 D. 5.98 X 1024 g PCl3 3.What is the coefficient
for H2after the following equation is balanced? _ HCl + Al → H2 + _ AlCl3 A. 2 B. 3 C. 4 D. 6
- What is the mass of one lead atom in grams? A. 3.441 X 10–22 g B. 4.803 X 10–3 g C. 2.891 X 1021 g D.
6.02 X 1023 g 5. Which of the following chemical equations is balanced? A.2H2 + O2 ➔ H2O B. 2SO 2+
2O2 ➔ 3SO 3 C.KClO 3 ➔ KCl + 3O2 D. N2 + 3H2 ➔ 2NH3 6. Given the following balanced chemical
equation, how many mol of potassium nitrate are formed if 4.2 mol of strontium hydroxide are formed?
2 KOH + Sr(NO3)2 → Sr(OH)2 + 2 KNO3 A. 8.4 mol KNO3 B. 4.2 mol KNO3 C. 2.1 mol KNO3 D. 6.022 mol
KNO3 7. If copper reacts with oxygen to form copper (I) oxide, which of the following equations correctly
represents this process? A. Cu2 + O2 → Cu2O B. 4 Cu + O2 → 2 Cu2O C. 2 Cu2 + O2 → 2 Cu2O D. 2 Cu +
O → Cu2O 8. The balanced equation for the complete combustion of propane (C3H8) is C3H8 + 5O2 →
4H2O + 3CO2 If 1 mole of propane and 10 moles of oxygen are placed in a sealed reaction container,
what will be left in the container after the reaction is complete? A. no propane, 5 moles of oxygen, 4
moles of water vapor, 3 moles of CO2 B. no propane, no oxygen, 4 moles of water vapor, 3 moles of CO2
C. no propane, no oxygen, 8 moles of water vapor, 6 moles of CO2 D. none of the above combinations is
correct 9. Given the following balanced chemical equation, if 15.0 g of KCl are formed, how many g of
O2 are also formed? 2 KClO3 → 2 KCl + 3 O2 A. 23.3 g O2 B. 4.29 g O2 C. 38.6 g O2 D. 9.66 g O2 10. What
is the coefficient for aluminum hydroxide after the following equation is balanced? _ Al2S3 + H2O
→ Al(OH)3 + _ H2S A. 1 B. 2 C. 3 D. 6 11. Which of the following samples contains the greatest
number of atoms? A. 1 mole CO2 B. 2 moles He C. 3 moles H2O D. 4 moles CO 12. For the reaction
2KClO3→ 2KCl+ 3O2, how many moles of oxygen are produced when 3.75 moles of starting material are
completely decomposed? A. 5.63 mol O2 B. 2.50 mol O2 C. 180 mol O2 D. 3.75 mol O2 13. Which of the
following has the smallest molar mass? A. SrCl2 B. MgCl2 C. CaCl2 D. FeCl2 14. Given the following
reaction, if 3.00 mol of Al are placed in a reaction vessel with 6.00 mol of CO2, how many mol of Al2O3
can theoretically be produced? 3 CO2 + 2 Al ➔ 3 CO + Al2O3 A. 9.00 mol B. 6.00 mol C. 3.00 mol D. 1.50
mol 15. Which of the following samples contains the largest number of atoms? A. 1 g Li B. 1 g F2 C. 1 g C
D. 1 g P4 16. If you have 7.86 X 1025 molecules of C3H8O, how many mol C3H8O of do you have? A. 4.73
X 1049 mol B. 7.86 X 1025 mol C. 766 mol D. 131 mol 17. What is the coefficient for O2 after you balance
the following equation: _ C3H6 + O2 ➔ CO2 + _ H2O A. 9 B. 6 C. 4 D. 2 18. Iron (III) oxide
reacts with carbon to form iron and carbon monoxide according to the following balanced chemical
equation: Fe2O3 + 3 C ➔ 2 Fe + 3 CO How many g of C had to react if 16.0 g of Fe are produced? A. 24.0
g C B. 5.16 g C C. 3.44 g C D. 20.6 g C 19. If nitrogen reacts with chlorine to form nitrogen trichloride,
which of the following equations correctly represents this process? A. N2 + 3 Cl2 → 2 NCl3 B. N2 + Cl2 →
NCl3 C. N + Cl → NCl3 D. N + 3 Cl → NCl3 20. Given the following reaction, how many g of CH2Br2 are
formed if 26.7 g of HBr are formed? CH4 + 2 Br2 ➔ CH2Br2 + 2 HBr A. 57.4 g CH2Br2 B. 115 g CH2Br2 C.
13.4 g CH2Br2 D. 28.7 g CH2Br2
Course
Professor
Date Due
Question 1
C
Question 2
A
Question 3
B
Question 4
A
Question 5
D
Question 6
A
Question 7
B
Question 8
A
Question 9
A
Question 10
B
Question 11
C
Question 12
A
Question 13
B
Question 14
D
Question 15
D
Question 16
D
Question 17
A
Question 18
A
Question 19
D
Question 20
C
References
Ball, P. (2002). The Ingredients: A Guided Tour of the Elements. Oxford: Oxford University
Press.
