问答题
From reactions(1)～(5)below，select，without any thermodynamic calculations those reactions which have：(a)large negative standard entropy changes，(b)large positive standard entropy changes，(c)small entropy changes which might be either positive or negative. (1)Mg(s)+Cl2(g)===MgCl2(s) (2)Mg(s)+I2(s)===MgI2(s) (3)C(s)+O2(g)===CO2(g) (4)Al2O3(s)+3C(s)+3Cl2(g)===2AlCl3(g)+3CO(g) (5)2NO(g)+Cl2(g)===2NOCl(g)
【正确答案】Solution： (1)large negative standard entropy changes：(1)，(5). (2)large positive standard entropy changes：(4). (3)small entropy changes which might be either positive or negative(2)，(3).