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Problem
Problem
In which reaction do the reactants have a lower energy than the products? a.
CH
4
(g)
+
2
O
2
(g)
→
CO
2
(g)
+
2
H
2
O(g)
\text{CH}_4\text{(g)} + 2\text{O}_2\text{(g)} \rightarrow \text{CO}_2\text{(g)} + 2\text{H}_2\text{O(g)}
CH
4
(g)
+
2
O
2
(g)
→
CO
2
(g)
+
2
H
2
O(g)
b.
HBr(g)
→
H(g)
+
Br(g)
\text{HBr(g)} \rightarrow \text{H(g)} + \text{Br(g)}
HBr(g)
→
H(g)
+
Br(g)
c.
Na
+
(g)
+
Cl
−
(g)
→
NaCl(s)
\text{Na}^+\text{(g)} + \text{Cl}^-\text{(g)} \rightarrow \text{NaCl(s)}
Na
+
(g)
+
Cl
−
(g)
→
NaCl(s)
d.
NaOH(aq)
+
HCl(aq)
→
NaCl(aq)
+
H
2
O(l)
\text{NaOH(aq)} + \text{HCl(aq)} \rightarrow \text{NaCl(aq)} + \text{H}_2\text{O(l)}
NaOH(aq)
+
HCl(aq)
→
NaCl(aq)
+
H
2
O(l)
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