Which one of the following is not a valid expression for the rate of the reaction below? 4nh3 + 7o2 → 4no2 + 6h2o which one of the following is not a valid expression for the rate of the reaction below? 4nh3 + 7o2 4no2 + 6h2o 16 δ[h2o]δt 14 δ[no2]δt - 14 δ[nh3]δt - 17 δ[o2]δt all of the above are valid expressions of the reaction rate.

Answer : All of the above are valid expressions of the reaction rate.

Explanation :

The given rate of reaction is,

The expression for rate of reaction for the reactant :

The expression for rate of reaction for the product :

From this we conclude that, all the options are correct.

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

more infor would

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