Nitric oxide reacts with oxygen according to
2NO(g)+O2(g)→2NO2(g), for which ΔH=−114kJ per reaction as written. A mixture contains 1.20g of NO and 0.80g of O2. After the reaction reaches completion at constant pressure, calculate (i) the heat q released (include sign) and (ii) the mass of the excess reactant that remains.