A:CO2(g)+NaOH(aq)═NaHCO3(aq)△H=﹣(2y﹣x)kJ•mol﹣1
B:CO2(g)+NaOH(aq)═NaHCO3(aq)△H=﹣(4x﹣y)kJ•mol﹣1
C:CO2(g)+NaOH(aq)═NaHCO3(aq)△H=﹣(2x﹣y)kJ•mol﹣1
D:2CO2(g)+2NaOH(l)═2NaHCO3(l)△H=﹣(8x﹣2y)kJ•mol﹣1