In International System (SI) units, what is any quantity of matter that contains 6.023 1023 at-oms, ...

In International System (SI) units, what is any quantity of matter that contains 6.023  1023 at-oms, molecules, or ions?
 
  a. Pound (lb)
  b. Gram (g)
  c. Ounce (oz)
  d. Mole (mol)

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Q. 2  According to Avogadro's law, under standard conditions of temperature and pressure (0 C and 760 mm Hg), 1 mol of any gas occupies which of the following?
 
  a. 1.34 L
  b. 22.40 L
  c. 7.48 L
  d. 28.30 L

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Q. 3  Which of the following best describes the physical concept of pressure?
 
  a. Weight  unit volume
  b. Mass  acceleration
  c. Force  distance
  d. Force  unit area

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Q. 4  What is the physical process whereby atoms or molecules tend to move from an area of higher concentration or pressure to an area of lower concentration or pressure?
 
  a. Sublimation
  b. Melting
  c. Diffusion
  d. Capillary action

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Q. 5  What is the density of a mixture of 40 oxygen (O2) and 60 helium at STPD?
 
  a. 0.34 g/L
  b. 0.55 g/L
  c. 0.68 g/L
  d. 1.25 g/L