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

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-

A 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