Homework Help: ap chemistry

Posted by cheri on Wednesday, October 31, 2012 at 5:43pm.

Which of the following reactions as written
corresponds to a standard formation reaction?
1. 2H (g) + O2(g) ! H2O2 (`)
2. Na(s) +
1
2
Cl2(g) ! NaCl(s)
3. CO2(s) ! CO2(g)
4. SO2(g) +
1
2
O2(g) ! SO3(g)
5. 2 H2(g) + O2(g) ! 2 H2O(`)

ap chemistry - cheri, Wednesday, October 31, 2012 at 5:47pm
1. 2H(g)+O2(g)->H2O2
2. Na(s)+1/2Cl2->NaCl(s)
3. Co2(s)->Co2(g)
4. So2(g)+1/2O2->So3(g)
5. 2H2(g)+O2(g)->2H2O
ap chemistry - DrBob222, Wednesday, October 31, 2012 at 10:34pm
1 is not.
2 is if you have 1/2 Cl2(g)
3. I don't understand the 2 but I think this is not because for Co I would write Co and not Co2.
4 is if you write 1/2 O2(g)
5 is not. You can make it one by
H2(g) + 1/2 O2(g) ==> H2O(g)

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