11.Sınıf Popquiz -1 (Entalpi)

H₂(g) + 108 kcal → 2H(g)

2I(g) → I₂(g) ∆H = -58 kcal/mole

The molar enthalpy of formation of HI is -38 kcal/mole. Calculate the average bond enthalpy of H-I bond in kcal.

In order to calculate the enthalpy of the given reaction, N₂H₂(g) + H₂(g) → N₂H₄(g)

Which bond energy is not used?

• N ≡ N

• N − N

• N − H

• H − H

• N = N

By using the given data, calculate the enthalpy change of the given reaction:

H₂O(g) → H₂(g) + 1/2O₂(g) ∆H₁ = 240 kJ

N₂(g) + 3H₂(g) → 2NH₃(g) ∆H₂ = -85 kJ

2NO(g) → N₂(g) + O₂(g) ∆H₃ = -120 kJ

How many kJ of heat is evolved in the reaction of 68 grams of NH₃ gas with excess amount of oxygen gas? (H:1, N:14)

2NH₃(g) + 5/2O₂(g) → 2NO(g)+ 3H₂O(g)

I. Burning of 4 grams of carbon solid to form CO gas yields 8.8 kJ of heat.

II. Burning of 4.8 grams of carbon solid to form CO₂ gas yields 37.6 kJ of heat.

Considering the information given above, calculate the enthalpy of the following reaction in kJ/mole. (C:12)

CO(g) + 1/2O₂(g) → CO₂(g)

The standard enthalpy change ΔHº for the thermal decomposition of silver nitrate according to the following equation is +78 kj:

AgNO₃(s) →AgNO₂(s) +1/2O₂(g)

ΔH_fº of AgNO₃(s) is -123 kj/mol. Calculate the standard enthalpy of formation of AgNO₂(s).

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