题目
1g H2完全燃烧生成液态水放出a KJ的热量,下列热化学方程式正确的是 A.H2 (g)+ 1/2 02(g)= H2O(l) △H = -a KJ.mol-1 B.2H2(g) + O2(g) = 2H2O(l) △H = -4a KJ.mol-1 C.2H2(g) + O2(g) = 2H2O(l) △H = +4a KJ.mol-1 D.H2(g) + 1/2 O2(g) = H2O(g) △H = -2a KJ.mol-1 答案:B
Those are ________.
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A.my two brother
B.two my brother
C.my two brothers
D.two my brothers