મિશ્રણ ની ઘનતા \({\rho _{mix}} = \,\,\,\frac{{{M_{mix}}}}{{{V_{mix}}}}\)

\({M_{mix}} = \,\,7\,\, + \,\,11\,\,\, = \,\,18\,\,g\,\, = \,\,18\,\, \times \,\,{10^{ - 3}}\,\,kg\,\)

આદર્શ વાયુ સમીકરણ પરથી \(\,\,{V_{mix}} = \,\,\,\frac{{{\mu _{mix}}\,R{T_{mix}}}}{{{P_{mix}}}}\,\) અહી \({\mu _{mix}} = \,\,{\mu _{{N_2}}} + {\mu _{{O_2}}} = \,\,\frac{7}{{28}}\,\, + \,\,\frac{{11}}{{44}}\,\, = \,\,\frac{1}{2}\,\, = \,\,0.5\,\,mol\)

\( \Rightarrow \,\,\,{V_{mix}} = \,\,\,\frac{{0.5\,\, \times \,\,8.31\,\, \times \,\,290}}{{1.01\,\, \times \,{{10}^5}}}\,\,\, \Rightarrow \,{\rho _{mix}} = \,\,\,\frac{{{M_{mix}}}}{{{V_{mix}}}} = \,\,\,\frac{{18\,\, \times \,\,{{10}^{ - 3}} \times \,\,1.01\,\,\, \times \,\,{{10}^5}}}{{0.5\,\, \times \,\,8.31\,\,\, \times \,\,290}}\,\, = \,\,1.5\,\,kg\,/\,\,{m^3}\)