The density of a gas is 1.43 g/mole at STP. What is the gas?

1 Answer
Junaid Mirza
Apr 9, 2018

#"O"_2#

Explanation:

#"STP"# conditions (before #1982#) are:

  • #"P = 1 atm"#
  • #"T = 273 K"#
  • #"V = 22.4 L"#

Density of gas is given by

#"d" = "PM"/"RT"#

#"M" = "dRT"/"P" = "1.43 g/L × 0.0821 L atm / (mol K) × 273 K"/"1 atm" = "32.0 g/mol"#

Molar mass of gas is #"32 g/mol"#. So the gas is #color(blue)("O"_2)#

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