Chemistry 101 Practice Test

The following practice test covers gases, liquids, formulas and stoichiometry.

1. If the molar mass of chlorine gas, Cl2, is 70.9 gmol, what mass of chlorine gas contains 0.652 moles of chlorine gas?
A. 109 g
B. 92.4 g
C. 46.2 g
D. 23.1 g
E. 9.20 g



2. How many grams of titanium dioxide are needed to have 0.850 mol?
A. 95.1 g
B. 10.6 g
C. 67.9 g
D. 94.0 g
E. 54.3 g



3. The mass percent sulfur in potassium sulfate is
A. 18.4%.
B. 23.7%.
C. 20.3%
D. 36.8%
E. 26.9%



4. The combustion of butane, C4H10(g), produces carbon dioxide and water vapor. In the balanced equation for this reaction, what are the coefficients of butane, oxygen, carbon dioxide, and water, respectively?
A. 2, 13, 4, 10
B. 1, 6, 4, 5
C. 1, 6, 8, 10
D. 1, 13, 4, 5
E. 2, 13, 8, 10



5. The following equation is unbalanced.
   F2 + H2O O3 + HF
In the balanced equation, the coefficient of HF is
A. 6
B. 3
C. 2
D. 4
E. 8



6. How many moles of carbon monoxide gas are produced when 0.422 moles of SnO2(s) react with excess carbon according to the equation below?
   SnO2(s) + 2C(s) Sn(s) + 2CO(g)
A. 0.633 mol
B. 0.211 mol
C. 0.422 mol
D. 1.27 mol
E. 0.844 mol



7. Consider the following reaction:
   5NaN3(s) + NaNO3(aq) 3Na2O(s) + 8N2(g)
If 2.0 moles of N2(g) are produced, how many moles of Na2O(s) are produced?
A. 0.38 mol
B. 8.0 mol
C. 0.75 mol
D. 5.3 mol
E. 0.63 mol



8. The following equation is unbalanced.
   KH + H2O KOH + H2
In the balanced equation, the coefficient of H2 is
A. 1
B. 2
C. 3
D. 4
E. 5



9. A 2.50-L sample of neon has a pressure of 1.59 atm at 45.0C. What volume would the sample have if the pressure is 725 Torr and the temperature 22.0C?
A. 3.07 L
B. 1.62 L
C. 3.87 L
D. 2.04 L
E. 0.733 L



10. A gas sample has a volume of 9.8 L at 720 Torr. If the temperature is constant, what volume does the gas sample have at 1.5 atm?
A. 6.9 L
B. 5.7 L
C. 0.16 L
D. 6.2 L
E. 9.3 L



11. A manufacturer of children's wagons has in stock 500 wagon bodies, 2200 wheels, and 750 axles. If each wagon produced has 1 body, 4 wheels, and 2 axles, how many wagons can be assembled?
A. 375
B. 625
C. 550
D. 500
E. 250



12. Which of the following has the highest boiling point?
A. I2
B. Br2
C. F2
D. Cl2
E. Ar



13. The boiling point of HF is higher than HCl due to
A. ion-dipole forces.
B. hydrogen bonding.
C. London forces.
D. dipole-dipole forces.
E. ion-ion forces.



14. Arrange the following substances in order of decreasing boiling point.
   H2O, PH3, H2S, CH4
A. H2S > H2O > CH4 > PH3
B. H2O > H2S > PH3 > CH4
C. CH4 > PH3 > H2S > H2O
D. H2O > H2S > CH4 > PH3
E. H2S > H2O > PH3 > CH4




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