which expression represents the ∆h for a chemical reaction in terms of the potential energy, pe, of its products and reactants?

a. pe of products + pe of reactants
b. pe of products – pe of reactants
c. pe of reactants × pe of products
d. pe of products ÷ pe of reactants
e. pe of reactants – pe of products

B. PE of products – PE of reactants

Explanation:

The enthalpy, H, reference to the amount of energy that a thermodynamic system exchanges with its environment, that is, the amount of energy that the system absorbs or releases. Its difference is calculated between the final and initial states of the system, so in a chemical reaction the final state is the one of the products and the initial state is the one of the reactants. By convention, this kind of difference are always the final state minus the initial state.

distance, luminosity, brightness, radius, chemical composition, and temperature

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :