P= po + pgh

the equation above gives the total pressure , p on an object submerged in a fluid , where po is the pressure at the fluid's surface , p is the density of the fluid , g is the acceleration due to gravity , and his the depth to which the object is submerged . what is h in terms of p , po , , and g ?

a. pg / p - po
b. p + po / pg
c. p + po + pg
d. p - po / pg

D. h = ( P - Po ) / ρg

Explanation:

clearing h:

⇒ P - Po = ρgh

⇒ ( P - Po ) / ( ρg ) = h

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.