Aduck with a mass of 0.90 kilograms flies at a rate of 12.0 m/s. what is the kinetic energy of the duck? 130 j 5.4 j 65 j 11 j

65 J

Explanation:

Kinetic energy is the energy possessed by an object by virtue of its motion.

K.E= Kinetic energy = ?

m= mass of duck = 0.90 kg

v= velocity of duck=

Putting in the values we get

Thus kinetic energy of the duck is 65 Joules.

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.