Potassium nitrate has a lattice energy of -640 kj mol-1 and a heat of solution o

Question

Potassium nitrate has a lattice energy of -640 kj mol-1 and a heat of solution of 30 kj mol-1. Calculate the heat of hydration.

The following reaction is carried out in a container with a movable piston (constant pressure): ClO(g) +O3(g)-> Cl(g)+2O2(g) Delta H rxn= -29.90kJ Which of the following statements is true?

-work is done on the system. the sign of delta e cannot be determined by given info

-work is done by the system E> 0

-work is done on system E> 0

-work is done by system E< 0

-work is done on the system E< 0

Explanation / Answer

heat of hydration = -640+30= -610 kj

delta H is negative means heat is released by system i.e work is done by system

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