以下反应均为放热反应,根据热化学方程式,比较△H1和△H2的大小
①I2(g)+H2(g)=2HI(g)△H1; I2(s)+H2(g)=2HI(g)△H2,则△H1___△H2
②H2(g)+Cl2(g)=2HCl(g)△H1; H2(g)+Br2(g)=2HBr(g)△H2,则△H1___△H2.