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Assignment help 7011

1- Which of the following relationships is/are CORRECT for gases?

 1.The amount of a gas (in moles) is inversely proportional to its volume (at constant temperature and pressure). 2.The volume of a gas is directly proportional to its temperature in kelvin (at constant pressure and moles). 3.The pressure of a gas is inversely proportional to its temperature in kelvin (at constant volume and moles).

  •  2 only
  •  1 only
  •  1 and 2
  •  3 only
  •  2 and 3

2- Hydrogen bonding is present in all of the following molecular solids EXCEPT ____.

  • CH3CO2H (acetic acid)
  • CH3OH (methanol)
  •  H2SO4 (dihydrogen sulfate)
  •  CH3OCH3 (dimethyl ether)
  • HF (hydrogen fluoride)

3- What is the hybridization of the central atom in a molecule with a square-pyramidal molecular geometry?

  •  sp3d2
  •  sp
  •  sp3
  •  sp3d
  •  sp2

4-

14.0 L gas cylinder contains 7.08 g He at 35.7 °C. What is the pressure inside the cylinder? (R = 0.08206 L×atm/mol×K)

  •  0.370 atm
  •  628 atm
  •  3.20 atm
  •  12.8 atm
  •  1.02 atm

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