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Free CLEP Science and Mathematics Exam Braindumps (page: 39)

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PDF with 494 Questions

Considering the following unbalanced equation how many moles of H2O are formed from three moles of oxygen? H2S + O2 SO2 + H2O

  1. 1
  2. 3/2
  3. 2
  4. 5/2
  5. 3

Answer(s): C

Explanation:

The balanced equation is 2H2S + 3O2 2SO2 + 2H2O



Complete ionization of a sodium sulfate molecule yields

  1. Na+, SO42-
  2. 2Na+, SO42-
  3. Na+, 2SO42-
  4. 2Na+, 2SO42-
  5. 2Na+, 3SO42-

Answer(s): B

Explanation:

The formula of sodium sulfate is (Na)2SO4. Thus, complete ionization yields two sodium ions and one sulfate ion.



H2S(aq) + MnO4-(aq) S(s) + MnO2(s) + H2O(l) + OH-(aq). Balancing this equation yields the following coefficients from left to right:

  1. 2, 1, 2, 1, 1, 1
  2. 1, 3, 1, 2, 2, 1
  3. 2, 3, 2, 3, 1, 2
  4. 3, 2, 2, 3, 2, 3
  5. 3, 2, 3, 2, 2, 2

Answer(s): E

Explanation:

The balanced equation is 3H2S(aq) + 2MnO4-(aq) 3S(s) + 2MnO2(s) + 2H2O(l) + 2OH-(aq)



The volume in liters of a 0.2M solution of NaOH needed to neutralize 2 liters of a 0.03M solution of HCl is

  1. 0.3 L
  2. 0.03 L
  3. 0.1 L
  4. 0.01 L
  5. 0.2 L

Answer(s): A

Explanation:

The reaction is HCl + NaOH NaC1 + H2O. Using the relationship M1V1 = M2V2, (2L)(0.03M) = (0.2M)(V2). Hence, V2, the volume of NaOH necessary is 0.3L.






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