Question

@uri

Answer 1

Hello:)

Answer 2

._.

Answer 3

Do you like Chemistry?

Answer 4

Like is an understatement.

Answer 5

What? You just confuesed me:( XD.

Answer 6

I ADORE Chemistry.

Answer 7

:O Ok. Wanna help me?

Answer 8

Sure.

Answer 9

Give me a sec. Lemme pull it upxD.

Answer 10

Here it is:)

Answer 11

The reaction you cited is

H2(g) + Cl2(g) ---> 2 HCl(g)

and you added the Bond Energies involved in corresponding compounds : these are the following ones

Bond energies of H-H bond = 436.4 kJ/mol
Bond energies of Cl-Cl bond = 242.7 kJ/mol
Bond energies of H-Cl bond = 431.9 kJ/mol

Now, since ENTHALPY HAS BEEN SPENT TO BREAK Covalent Bonds in Reactant Molecules AND ENTHALPY GIVE OFF by forming of Covalent Bonds for Product Molecules.
So, the calculation I make is

1 * 436.4 + 1 * 242.7 - 2 * 431.9 = -247.2 kJ/mol

Answer 12

Thankx gir:)