H2o has a hvap = 40.7 kj/mol. what is the quantity of heat that is released when 27.9 g of h2o condenses? use . 60.00 kj 61.05 kj 63.09 kj 68.60 kj

The quantity of heat released is 63.09 kJ.

n = 27.9 g H₂O × (1 mol H₂O/18.02 g H₂O) = 1.548 mol H₂O

ΔH_cond = -ΔH_vap = -40.7 kJ·mol⁻¹

The negative sign shows that the water vapour is releasing energy as it condenses.

q = nΔH_cond = 1.548 mol × (-40.7 kJ·mol⁻¹) = -63.0 kJ

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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