2LiNO3△→Li2O+2NO2+12O2
1 mol of LiNO3 will produce 1 mole of NO2
2Mg(NO3)2△→2MgO+4NO2+O2
1 mol of Mg (NO3)2 will produce 2 moles of NO2
2Ca(NO3)2△→2CaO+4NO2+O2
So, 1 mole of Ca(NO3)2 will produce 2 moles of NO2
2NaNO3△→2NaNO2+O2
Hence, total number of moles of NO2 produced = 1+2+2 = 5