I used the https://ptable.com
O2=2(15.999)=31.998
N2=2(14.007)=28.014
NO2=14.007+2(15.999)=46.005
Lets solve one by one using unit conversions
O2=1 mol/31.998 g
88g of O2= 88*1 mol/31.998g
88/31.998 moles of O2=2.531408213013313332083 moles of O2
N2=1 mol/28.014
88g of N2=88*1 mol/28.014
88/28.014 moles of N2=3.141286499607339187549 moles of N2
NO2= 1 mol/46.005
12g of NO2=12*1 mol/46.005
12/46.005 moles of NO2=0.2608412129116400391262 moles of NO2
0.2608412129116400391262/5.933535925532292558758=0.04396050115568149888328. To make life simpler, im going to round it to
0.04396.
Fractional form is
1099/25000
I dont know if this is correct-It doesnt seem like it-but I tried