Free CLEP Science and Mathematics Exam Braindumps (page: 48)

Page 47 of 128

If there are 12.04 × 1023 atoms of H2(g), how many liters of H2 are there at STP?

  1. 5.6 L
  2. 11.2 L
  3. 22.4 L
  4. 33.6 L
  5. 44.8 L

Answer(s): E

Explanation:

If there are 12.04 × 1023 atoms, and there are 6.02 × 1023 atoms per mole, there are two moles of H2 present. There are 22.4 liters of gas per mole present at STP, so there are 44.8L of H2O present.



Colligative properties of solutions apply to which of the following?

  1. Determination of the heat of reaction
  2. Determination of empirical formula
  3. Determination of ionization energy
  4. Determination of molecular weight
  5. Determination of boiling point

Answer(s): E

Explanation:

Colligative properties are the properties of a solution that depends on the nature of the solvent and the number of solute particles present. Boiling point is affected by the number of solute particles in a solvent.



Determine the oxidation state of Si in H2SiF6.

  1. -4
  2. -2
  3. +2
  4. +4
  5. +6

Answer(s): D

Explanation:

The oxidation number of H is +1 and the oxidation number of F is -1, thus Si must be +4 to balance the charge.



For the following reaction at equilibrium, NH4Cl(s) NH3(g) + HCl(g) the partial pressure of NH3 is 1.2 atm and the partial pressure of HCl is 2.0 atm. What is the value of Kp?

  1. 0.6
  2. 0.8
  3. 1.7
  4. 2.4
  5. 3.2

Answer(s): D

Explanation:

The expression for Kp is PNH3 × PNHCl. (Solids are not part of equilibrium expressions.) Thus, Kp = 1.2 × 2 = 2.4






Post your Comments and Discuss Test Prep CLEP Science and Mathematics exam with other Community members:

CLEP Science and Mathematics Exam Discussions & Posts