Question

化学反映热的计算已知A(g)+B(g)=C(g) H1D(g)+E(g)=E(g) H2,且H1

Answer 1

D(g)+B(g)=E(g) H2 A(g)+B(g)=C(g) H1

X X X*H2 Y Y Y*H1

X*H2+ Y*H1=H3

X+Y=1

(1-Y)*H2+ Y*H1=H3

Y(H1-H2）=H3-H2

Y=(H3-H2)/(H1-H2)

X=1-Y=(H1-H3)/(H1-H2)

X/Y=(H1-H3)/(H3-H2)

不就是D吗,上下都变号.