在298 K 101 kPa时,已知:2H 2 (g) + O 2 (g) = 2H 2 O(g) Δ H 1 ;Cl 2 (g) + H 2 (g) =' 2HCl(g)' Δ H 2 ;2Cl 2 (g) + 2H 2 O(g) =' 4HCl(g)' + O 2 (g) Δ H 3 ;则Δ H 3 与Δ H 1 和Δ H 2 间的关系正确的是
A.
Δ H 3 =Δ H 1 + 2Δ H 2
B.
Δ H 3 =Δ H 1 +Δ H 2
C.
Δ H 3 = 2Δ H 2 -Δ H 1
D.
Δ H 3 =Δ H 1 -Δ H 2
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