An ideal gas is one that

a gas whose particles exhibit no attractive interactions whatsoever

a gas whose particles exhibit strong attractive interactions

a gas whose particles exhibit behaviors that closely resemble hydrogen

a gas whose particles exhibit behaviors that closely resemble neon

An ideal gas is one that  a gas whose particles exhibit no attractive interactions whatsoever

Option A

Explanation:

Gas is considered as ideal if the particles present so far away that they do not expose attractive forces to each other. But in reality, there is no ideal gas, but the gas behaves almost perfectly at low pressures and high temperatures (conditions in which individual particles move very fast and far apart, so their interaction is close to zero). That is why the law of ideal gas is such a useful approach. The equation of ideal gas depends on:

                        PV = nRT

Where,

P – pressure in atm or kPa

T – temperature in Kelvin

n – Number of moles of gas

V – volume in litres

R – gas constant (8.3145 J/mol/K)

An ideal gas does not show attractive force between the particles.  In the equation, volume and pressures are directly proportionate to temperature.

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.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).