the combustion of solid benzoic acid is taking place. give the equation of this process & the value of delta Ng.

Benzoic acid is C6H5COOH or C7H6O2.

2C7H6O2 +15O2 ==> 14CO2 + 6H2O
Did you mean Ng or something else. At any rate, you must look up delta H, delta G, or any other values.

To determine the equation and value of ΔNg (change in the number of moles of gas) for the combustion of solid benzoic acid, there are a few steps to follow:

1. Write the balanced equation for the combustion of benzoic acid:
C6H5COOH(s) + 15/2 O2(g) -> 7CO2(g) + 3H2O(g)

2. Determine the stoichiometric coefficients of the reactants and products in the balanced equation. In this case, for every one mole of solid benzoic acid, we need 15/2 moles of oxygen gas to react and produce 7 moles of carbon dioxide gas and 3 moles of water vapor.

Now, let's calculate the ΔNg:

ΔNg(to the right) = (Σmole coefficients of products) - (Σmole coefficients of reactants)

ΔNg(to the right) = (7 CO2 + 3 H2O) - (1 C6H5COOH + 15/2 O2)
= 7 - 1 + 3 - (15/2)
= 4.5 moles of gas

Therefore, the value of ΔNg for the combustion of solid benzoic acid is 4.5 moles of gas.