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