Find This the bond energy

H  

2

(g)+  

2

1

O  

2

(g)⟶H  

2

O(l)ΔHr−285.8=−  

2

571.6

H  

2

O(l)⟶H  

2

O(g)+40.6

∴ H  

2

O(g)+  

2

1

O  

2

(g)⟶H  

2

O(g)−245.2 KJ/mol

Let the average OH bond energy in H  

2

O be x

∴ −245.2=(435+244.8)−(2x)

⇒ 2x=435+244.8+245.2

⇒ x=  

2

925

=462.5 KJ/mol

H−H+  

2

1

O−O→H−O−H

Explanation:

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

m=9

step-by-step explanation: