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NEET-XII-Physics

24: Kinetic Theory of Gases

with Solutions - page 4
Qstn# iv-4 Prvs-QstnNext-Qstn
  • #4
    Calculate the mass of 1 cm3 of oxygen kept at STP.
    Ans : We know that 22.4 L of O2 contains 1 mol O2 at STP. Thus,
    `` 22.4\times {10}^{3}{\,\mathrm{\,cm\,}}^{3}\,\mathrm{\,of\,}{\,\mathrm{\,O\,}}_{2}=1\,\mathrm{\,mol\,}{\,\mathrm{\,O\,}}_{2}``
    `` 1{\,\mathrm{\,cm\,}}^{3}\,\mathrm{\,of\,}{\,\mathrm{\,O\,}}_{2}=\frac{1}{22.4\times {10}^{3}}\,\mathrm{\,mol\,}{\,\mathrm{\,O\,}}_{2}``
    `` 1\,\mathrm{\,mol\,}\,\mathrm{\,of\,}{\,\mathrm{\,O\,}}_{2}=32\,\mathrm{\,g\,}``
    `` \frac{1}{22.4\times {10}^{3}}\,\mathrm{\,mol\,}\,\mathrm{\,of\,}{\,\mathrm{\,O\,}}_{2}=\frac{32}{22.4\times {10}^{3}}=1.43\times {10}^{-3}\,\mathrm{\,g\,}``
    `` =1.43\,\mathrm{\,mg\,}``
    `` ``