Question

4 g of co2 and 22.4 liter of h2 at stp are mixed in a container the total numbet of molecules present in container

Answer 1

no. of moles of Co2= m/mw
                               = 4/44
                               = 1/11

no. molecules of Co2= no. of moles*Avagadro no. (NA=6.623*10^23)
                                   = NA/11

 no. moles of H2= 22.4/22.4= 1
no.of molecules= 1*NA =NA


therefore,
Total no. molcules will equal to= NA/11 +NA
                                                  12NA/11