Answer :
The enthalpy change per gram of nitric oxide is -1.9KJ/g.
How are the enthalpy changes found?
Calculating the reaction enthalpy involves deducting the total enthalpy of all the reactants from the total enthalpy of the products. Mathematically, tH is equal to the total of the enthalpies of the reactants and the sum of the enthalpies of the product.
The value of enthalpy is solely dependent on the temperature, pressure, and composition of the system, not on its history. It is an energy-like feature or state function that has the dimensions of energy (and is thus measured in units of joules or ergs).
2NO(g) + O₂(g) → 2NO₂(g)
According to reaction,
2 × 30g NO = -114KJ (Enthalpy change)
1g NO = -114/2× 30 = -1.9KJ
∆H = -1.9KJ/g.
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