题目内容

The DHorxn for which reaction is a standard enthalpy of formation? ( )

A. SnCl4(l) ® SnCl2(s) + Cl2(g)
B. SnCl2(l) ® Sn(s) + Cl2(g)
C. 2Cl2(g) + O2(g) ® 2Cl2O(g)
D. Cl2(g) + H2O(l) ® HCl(aq) + HOCl(aq)

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A. silicon (Si)
B. carbon (C)
C. oxygen (O)
D. arsenic (As)

A. heterogeneous mixture
B. homogeneous mixture
C. an element
D. a compound

A. 6
B. 3
C. 7
D. 4

A. The solution is unsaturated
B. The solution is saturated
C. The solution is supersaturate
D. It is hard to know from the conditions given