Athermometer is placed in water in order to measure the water’s temperature. what would cause the liquid in the thermometer to rise? a. the molecules in the water move closer together. b. the molecules in the thermometer’s liquid spread apart. c. the kinetic energy of the water molecules decreases. d. the kinetic energy of the thermometer’s liquid molecules decreases

Answer : Option B) The molecules in the thermometer’s liquid spread apart.

Explanation : When a thermometer was placed in water to measure the water’s temperature. the molecules in the thermometer liquid which is often mercury spreads apart and rises, this shows a temperature increase in the thermometer.

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.

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